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Account for if (let pat = expr) {}

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Partially address #82827.
This commit is contained in:
Esteban Küber 2021-03-06 18:29:41 -08:00
parent 1c77a1fa3c
commit e62a543344
8 changed files with 216 additions and 231 deletions
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8
compiler/rustc_ast/src/ast.rs
View File

@ -1139,6 +1139,14 @@ pub fn to_bound(&self) -> Option<GenericBound> {
}
}
pub fn peel_parens(&self) -> &Expr {
let mut expr = self;
while let ExprKind::Paren(inner) = &expr.kind {
expr = &inner;
}
expr
}
/// Attempts to reparse as `Ty` (for diagnostic purposes).
pub fn to_ty(&self) -> Option<P<Ty>> {
let kind = match &self.kind {

49
compiler/rustc_ast_lowering/src/expr.rs
View File

@ -97,6 +97,23 @@ pub(super) fn lower_expr_mut(&mut self, e: &Expr) -> hir::Expr<'hir> {
ExprKind::Let(ref pat, ref scrutinee) => {
self.lower_expr_if_let(e.span, pat, scrutinee, then, else_opt.as_deref())
}
ExprKind::Paren(ref paren) => match paren.peel_parens().kind {
ExprKind::Let(ref pat, ref scrutinee) => {
// A user has written `if (let Some(x) = foo) {`, we want to avoid
// confusing them with mentions of nightly features.
// If this logic is changed, you will also likely need to touch
// `unused::UnusedParens::check_expr`.
self.if_let_expr_with_parens(cond, &paren.peel_parens());
self.lower_expr_if_let(
e.span,
pat,
scrutinee,
then,
else_opt.as_deref(),
)
}
_ => self.lower_expr_if(cond, then, else_opt.as_deref()),
},
_ => self.lower_expr_if(cond, then, else_opt.as_deref()),
},
ExprKind::While(ref cond, ref body, opt_label) => self
@ -346,6 +363,32 @@ fn lower_legacy_const_generics(
hir::ExprKind::Call(f, self.lower_exprs(&real_args))
}
fn if_let_expr_with_parens(&mut self, cond: &Expr, paren: &Expr) {
let start = cond.span.until(paren.span);
let end = paren.span.shrink_to_hi().until(cond.span.shrink_to_hi());
let mut err = self.sess.struct_span_err(
vec![start, end],
"invalid parentheses around `let` expression in `if let`",
);
if self.sess.opts.unstable_features.is_nightly_build() {
err.note(
"only supported directly without parentheses in conditions of `if`- and \
`while`-expressions, as well as in `let` chains within parentheses",
);
} else {
err.note("variable declaration using `let` is a statement, not a condition");
}
err.multipart_suggestion(
"`if let` needs to be written without parentheses",
vec![(start, String::new()), (end, String::new())],
rustc_errors::Applicability::MachineApplicable,
);
err.emit();
// Ideally, we'd remove the feature gating of a `let` expression since we are already
// complaining about it here, but `feature_gate::check_crate` has already run by now:
// self.sess.parse_sess.gated_spans.ungate_last(sym::let_chains, paren.span);
}
/// Emit an error and lower `ast::ExprKind::Let(pat, scrutinee)` into:
/// ```rust
/// match scrutinee { pats => true, _ => false }
@ -356,8 +399,10 @@ fn lower_expr_let(&mut self, span: Span, pat: &Pat, scrutinee: &Expr) -> hir::Ex
if self.sess.opts.unstable_features.is_nightly_build() {
self.sess
.struct_span_err(span, "`let` expressions are not supported here")
.note("only supported directly in conditions of `if`- and `while`-expressions")
.note("as well as when nested within `&&` and parenthesis in those conditions")
.note(
"only supported directly without parentheses in conditions of `if`- and \
`while`-expressions, as well as in `let` chains within parentheses",
)
.emit();
} else {
self.sess

31
compiler/rustc_lint/src/unused.rs
View File

@ -602,7 +602,7 @@ fn check_expr(&mut self, cx: &EarlyContext<'_>, e: &ast::Expr) {
use rustc_ast::ExprKind::*;
let (value, ctx, followed_by_block, left_pos, right_pos) = match e.kind {
// Do not lint `unused_braces` in `if let` expressions.
If(ref cond, ref block, ..)
If(ref cond, ref block, _)
if !matches!(cond.kind, Let(_, _)) || Self::LINT_EXPR_IN_PATTERN_MATCHING_CTX =>
{
let left = e.span.lo() + rustc_span::BytePos(2);
@ -816,8 +816,33 @@ fn check_unused_parens_pat(
impl EarlyLintPass for UnusedParens {
fn check_expr(&mut self, cx: &EarlyContext<'_>, e: &ast::Expr) {
if let ExprKind::Let(ref pat, ..) | ExprKind::ForLoop(ref pat, ..) = e.kind {
self.check_unused_parens_pat(cx, pat, false, false);
match e.kind {
ExprKind::Let(ref pat, _) | ExprKind::ForLoop(ref pat, ..) => {
self.check_unused_parens_pat(cx, pat, false, false);
}
// We ignore parens in cases like `if (((let Some(0) = Some(1))))` because we already
// handle a hard error for them during AST lowering in `lower_expr_mut`, but we still
// want to complain about things like `if let 42 = (42)`.
ExprKind::If(ref cond, ref block, ref else_)
if matches!(cond.peel_parens().kind, ExprKind::Let(..)) =>
{
self.check_unused_delims_expr(
cx,
cond.peel_parens(),
UnusedDelimsCtx::LetScrutineeExpr,
true,
None,
None,
);
for stmt in &block.stmts {
<Self as UnusedDelimLint>::check_stmt(self, cx, stmt);
}
if let Some(e) = else_ {
<Self as UnusedDelimLint>::check_expr(self, cx, e);
}
return;
}
_ => {}
}
<Self as UnusedDelimLint>::check_expr(self, cx, e)

3
src/test/ui/pattern/issue-82290.stderr
View File

@ -4,8 +4,7 @@ error: `let` expressions are not supported here
LL | if true && let x = 1 {
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
warning: the feature `let_chains` is incomplete and may not be safe to use and/or cause compiler crashes
--> $DIR/issue-82290.rs:1:12

48
src/test/ui/rfc-2294-if-let-guard/feature-gate.stderr
View File

@ -175,8 +175,7 @@ error: `let` expressions are not supported here
LL | () if (let 0 = 1) => {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:14:18
@ -184,8 +183,7 @@ error: `let` expressions are not supported here
LL | () if (((let 0 = 1))) => {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:18:23
@ -193,8 +191,7 @@ error: `let` expressions are not supported here
LL | () if true && let 0 = 1 => {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:22:15
@ -202,8 +199,7 @@ error: `let` expressions are not supported here
LL | () if let 0 = 1 && true => {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:26:16
@ -211,8 +207,7 @@ error: `let` expressions are not supported here
LL | () if (let 0 = 1) && true => {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:30:24
@ -220,8 +215,7 @@ error: `let` expressions are not supported here
LL | () if true && (let 0 = 1) => {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:34:16
@ -229,8 +223,7 @@ error: `let` expressions are not supported here
LL | () if (let 0 = 1) && (let 0 = 1) => {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:34:31
@ -238,8 +231,7 @@ error: `let` expressions are not supported here
LL | () if (let 0 = 1) && (let 0 = 1) => {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:40:15
@ -247,8 +239,7 @@ error: `let` expressions are not supported here
LL | () if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) => {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:40:28
@ -256,8 +247,7 @@ error: `let` expressions are not supported here
LL | () if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) => {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:40:42
@ -265,8 +255,7 @@ error: `let` expressions are not supported here
LL | () if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) => {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:40:55
@ -274,8 +263,7 @@ error: `let` expressions are not supported here
LL | () if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) => {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:40:68
@ -283,8 +271,7 @@ error: `let` expressions are not supported here
LL | () if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) => {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:52:15
@ -292,8 +279,7 @@ error: `let` expressions are not supported here
LL | () if let Range { start: _, end: _ } = (true..true) && false => {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:68:16
@ -301,8 +287,7 @@ error: `let` expressions are not supported here
LL | use_expr!((let 0 = 1 && 0 == 0));
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:71:16
@ -310,8 +295,7 @@ error: `let` expressions are not supported here
LL | use_expr!((let 0 = 1));
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: aborting due to 35 previous errors

168
src/test/ui/rfc-2497-if-let-chains/disallowed-positions.stderr
View File

@ -15,8 +15,7 @@ error: `let` expressions are not supported here
LL | if &let 0 = 0 {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:35:9
@ -24,8 +23,7 @@ error: `let` expressions are not supported here
LL | if !let 0 = 0 {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:36:9
@ -33,8 +31,7 @@ error: `let` expressions are not supported here
LL | if *let 0 = 0 {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:38:9
@ -42,8 +39,7 @@ error: `let` expressions are not supported here
LL | if -let 0 = 0 {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:46:9
@ -51,8 +47,7 @@ error: `let` expressions are not supported here
LL | if (let 0 = 0)? {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:50:16
@ -60,8 +55,7 @@ error: `let` expressions are not supported here
LL | if true || let 0 = 0 {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:51:17
@ -69,8 +63,7 @@ error: `let` expressions are not supported here
LL | if (true || let 0 = 0) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:52:25
@ -78,8 +71,7 @@ error: `let` expressions are not supported here
LL | if true && (true || let 0 = 0) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:53:25
@ -87,8 +79,7 @@ error: `let` expressions are not supported here
LL | if true || (true && let 0 = 0) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:56:12
@ -96,8 +87,7 @@ error: `let` expressions are not supported here
LL | if x = let 0 = 0 {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:59:15
@ -105,8 +95,7 @@ error: `let` expressions are not supported here
LL | if true..(let 0 = 0) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:61:11
@ -114,8 +103,7 @@ error: `let` expressions are not supported here
LL | if ..(let 0 = 0) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:63:9
@ -123,8 +111,7 @@ error: `let` expressions are not supported here
LL | if (let 0 = 0).. {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:67:8
@ -132,8 +119,7 @@ error: `let` expressions are not supported here
LL | if let Range { start: _, end: _ } = true..true && false {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:71:8
@ -141,8 +127,7 @@ error: `let` expressions are not supported here
LL | if let Range { start: _, end: _ } = true..true || false {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:78:8
@ -150,8 +135,7 @@ error: `let` expressions are not supported here
LL | if let Range { start: F, end } = F..|| true {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:86:8
@ -159,8 +143,7 @@ error: `let` expressions are not supported here
LL | if let Range { start: true, end } = t..&&false {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:92:19
@ -168,8 +151,7 @@ error: `let` expressions are not supported here
LL | if let true = let true = true {}
| ^^^^^^^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:96:12
@ -177,8 +159,7 @@ error: `let` expressions are not supported here
LL | while &let 0 = 0 {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:99:12
@ -186,8 +167,7 @@ error: `let` expressions are not supported here
LL | while !let 0 = 0 {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:100:12
@ -195,8 +175,7 @@ error: `let` expressions are not supported here
LL | while *let 0 = 0 {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:102:12
@ -204,8 +183,7 @@ error: `let` expressions are not supported here
LL | while -let 0 = 0 {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:110:12
@ -213,8 +191,7 @@ error: `let` expressions are not supported here
LL | while (let 0 = 0)? {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:114:19
@ -222,8 +199,7 @@ error: `let` expressions are not supported here
LL | while true || let 0 = 0 {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:115:20
@ -231,8 +207,7 @@ error: `let` expressions are not supported here
LL | while (true || let 0 = 0) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:116:28
@ -240,8 +215,7 @@ error: `let` expressions are not supported here
LL | while true && (true || let 0 = 0) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:117:28
@ -249,8 +223,7 @@ error: `let` expressions are not supported here
LL | while true || (true && let 0 = 0) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:120:15
@ -258,8 +231,7 @@ error: `let` expressions are not supported here
LL | while x = let 0 = 0 {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:123:18
@ -267,8 +239,7 @@ error: `let` expressions are not supported here
LL | while true..(let 0 = 0) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:125:14
@ -276,8 +247,7 @@ error: `let` expressions are not supported here
LL | while ..(let 0 = 0) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:127:12
@ -285,8 +255,7 @@ error: `let` expressions are not supported here
LL | while (let 0 = 0).. {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:131:11
@ -294,8 +263,7 @@ error: `let` expressions are not supported here
LL | while let Range { start: _, end: _ } = true..true && false {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:135:11
@ -303,8 +271,7 @@ error: `let` expressions are not supported here
LL | while let Range { start: _, end: _ } = true..true || false {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:142:11
@ -312,8 +279,7 @@ error: `let` expressions are not supported here
LL | while let Range { start: F, end } = F..|| true {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:150:11
@ -321,8 +287,7 @@ error: `let` expressions are not supported here
LL | while let Range { start: true, end } = t..&&false {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:156:22
@ -330,8 +295,7 @@ error: `let` expressions are not supported here
LL | while let true = let true = true {}
| ^^^^^^^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:170:6
@ -339,8 +303,7 @@ error: `let` expressions are not supported here
LL | &let 0 = 0;
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:172:6
@ -348,8 +311,7 @@ error: `let` expressions are not supported here
LL | !let 0 = 0;
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:173:6
@ -357,8 +319,7 @@ error: `let` expressions are not supported here
LL | *let 0 = 0;
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:175:6
@ -366,8 +327,7 @@ error: `let` expressions are not supported here
LL | -let 0 = 0;
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:183:6
@ -375,8 +335,7 @@ error: `let` expressions are not supported here
LL | (let 0 = 0)?;
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:187:13
@ -384,8 +343,7 @@ error: `let` expressions are not supported here
LL | true || let 0 = 0;
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:188:14
@ -393,8 +351,7 @@ error: `let` expressions are not supported here
LL | (true || let 0 = 0);
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:189:22
@ -402,8 +359,7 @@ error: `let` expressions are not supported here
LL | true && (true || let 0 = 0);
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:192:9
@ -411,8 +367,7 @@ error: `let` expressions are not supported here
LL | x = let 0 = 0;
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:194:12
@ -420,8 +375,7 @@ error: `let` expressions are not supported here
LL | true..(let 0 = 0);
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:195:8
@ -429,8 +383,7 @@ error: `let` expressions are not supported here
LL | ..(let 0 = 0);
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:196:6
@ -438,8 +391,7 @@ error: `let` expressions are not supported here
LL | (let 0 = 0)..;
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:198:6
@ -447,8 +399,7 @@ error: `let` expressions are not supported here
LL | (let Range { start: _, end: _ } = true..true || false);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:202:6
@ -456,8 +407,7 @@ error: `let` expressions are not supported here
LL | (let true = let true = true);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:202:17
@ -465,8 +415,7 @@ error: `let` expressions are not supported here
LL | (let true = let true = true);
| ^^^^^^^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:207:6
@ -474,8 +423,7 @@ error: `let` expressions are not supported here
LL | &let 0 = 0
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:218:17
@ -483,8 +431,7 @@ error: `let` expressions are not supported here
LL | true && let 1 = 1
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:222:17
@ -492,8 +439,7 @@ error: `let` expressions are not supported here
LL | true && let 1 = 1
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:226:17
@ -501,8 +447,7 @@ error: `let` expressions are not supported here
LL | true && let 1 = 1
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/disallowed-positions.rs:236:17
@ -510,8 +455,7 @@ error: `let` expressions are not supported here
LL | true && let 1 = 1
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
warning: the feature `const_generics` is incomplete and may not be safe to use and/or cause compiler crashes
--> $DIR/disallowed-positions.rs:20:12

6
src/test/ui/rfc-2497-if-let-chains/feature-gate.rs
View File

@ -13,11 +13,11 @@ fn _if() {
if (let 0 = 1) {}
//~^ ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions are not supported here
//~| ERROR invalid parentheses around `let` expression in `if let`
if (((let 0 = 1))) {}
//~^ ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions are not supported here
//~| ERROR invalid parentheses around `let` expression in `if let`
if true && let 0 = 1 {}
//~^ ERROR `let` expressions in this position are experimental [E0658]
@ -126,7 +126,7 @@ macro_rules! use_expr {
//~| ERROR `let` expressions are not supported here
use_expr!((let 0 = 1));
//~^ ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions are not supported here
//~| ERROR invalid parentheses around `let` expression in `if let`
//~| ERROR `let` expressions are not supported here
#[cfg(FALSE)] (let 0 = 1);
//~^ ERROR `let` expressions in this position are experimental [E0658]

134
src/test/ui/rfc-2497-if-let-chains/feature-gate.stderr
View File

@ -295,23 +295,29 @@ LL | use_expr!((let 0 = 1));
= note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
= help: add `#![feature(let_chains)]` to the crate attributes to enable
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:14:9
error: invalid parentheses around `let` expression in `if let`
--> $DIR/feature-gate.rs:14:8
|
LL | if (let 0 = 1) {}
| ^^^^^^^^^
| ^ ^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
help: `if let` needs to be written without parentheses
|
LL | if let 0 = 1 {}
| -- --
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:18:11
error: invalid parentheses around `let` expression in `if let`
--> $DIR/feature-gate.rs:18:8
|
LL | if (((let 0 = 1))) {}
| ^^^^^^^^^
| ^^^ ^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
help: `if let` needs to be written without parentheses
|
LL | if let 0 = 1 {}
| -- --
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:22:16
@ -319,8 +325,7 @@ error: `let` expressions are not supported here
LL | if true && let 0 = 1 {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:26:8
@ -328,8 +333,7 @@ error: `let` expressions are not supported here
LL | if let 0 = 1 && true {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:30:9
@ -337,8 +341,7 @@ error: `let` expressions are not supported here
LL | if (let 0 = 1) && true {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:34:17
@ -346,8 +349,7 @@ error: `let` expressions are not supported here
LL | if true && (let 0 = 1) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:38:9
@ -355,8 +357,7 @@ error: `let` expressions are not supported here
LL | if (let 0 = 1) && (let 0 = 1) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:38:24
@ -364,8 +365,7 @@ error: `let` expressions are not supported here
LL | if (let 0 = 1) && (let 0 = 1) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:44:8
@ -373,8 +373,7 @@ error: `let` expressions are not supported here
LL | if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:44:21
@ -382,8 +381,7 @@ error: `let` expressions are not supported here
LL | if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:44:35
@ -391,8 +389,7 @@ error: `let` expressions are not supported here
LL | if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:44:48
@ -400,8 +397,7 @@ error: `let` expressions are not supported here
LL | if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:44:61
@ -409,8 +405,7 @@ error: `let` expressions are not supported here
LL | if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:56:8
@ -418,8 +413,7 @@ error: `let` expressions are not supported here
LL | if let Range { start: _, end: _ } = (true..true) && false {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:64:12
@ -427,8 +421,7 @@ error: `let` expressions are not supported here
LL | while (let 0 = 1) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:68:14
@ -436,8 +429,7 @@ error: `let` expressions are not supported here
LL | while (((let 0 = 1))) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:72:19
@ -445,8 +437,7 @@ error: `let` expressions are not supported here
LL | while true && let 0 = 1 {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:76:11
@ -454,8 +445,7 @@ error: `let` expressions are not supported here
LL | while let 0 = 1 && true {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:80:12
@ -463,8 +453,7 @@ error: `let` expressions are not supported here
LL | while (let 0 = 1) && true {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:84:20
@ -472,8 +461,7 @@ error: `let` expressions are not supported here
LL | while true && (let 0 = 1) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:88:12
@ -481,8 +469,7 @@ error: `let` expressions are not supported here
LL | while (let 0 = 1) && (let 0 = 1) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:88:27
@ -490,8 +477,7 @@ error: `let` expressions are not supported here
LL | while (let 0 = 1) && (let 0 = 1) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:94:11
@ -499,8 +485,7 @@ error: `let` expressions are not supported here
LL | while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:94:24
@ -508,8 +493,7 @@ error: `let` expressions are not supported here
LL | while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:94:38
@ -517,8 +501,7 @@ error: `let` expressions are not supported here
LL | while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:94:51
@ -526,8 +509,7 @@ error: `let` expressions are not supported here
LL | while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:94:64
@ -535,8 +517,7 @@ error: `let` expressions are not supported here
LL | while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:106:11
@ -544,8 +525,7 @@ error: `let` expressions are not supported here
LL | while let Range { start: _, end: _ } = (true..true) && false {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:123:16
@ -553,8 +533,7 @@ error: `let` expressions are not supported here
LL | use_expr!((let 0 = 1 && 0 == 0));
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:123:16
@ -562,8 +541,19 @@ error: `let` expressions are not supported here
LL | use_expr!((let 0 = 1 && 0 == 0));
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: invalid parentheses around `let` expression in `if let`
--> $DIR/feature-gate.rs:127:15
|
LL | use_expr!((let 0 = 1));
| ^ ^
|
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
help: `if let` needs to be written without parentheses
|
LL | use_expr!(let 0 = 1);
| -- --
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:127:16
@ -571,17 +561,7 @@ error: `let` expressions are not supported here
LL | use_expr!((let 0 = 1));
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
error: `let` expressions are not supported here
--> $DIR/feature-gate.rs:127:16
|
LL | use_expr!((let 0 = 1));
| ^^^^^^^^^
|
= note: only supported directly in conditions of `if`- and `while`-expressions
= note: as well as when nested within `&&` and parenthesis in those conditions
= note: only supported directly without parentheses in conditions of `if`- and `while`-expressions, as well as in `let` chains within parentheses
error: aborting due to 65 previous errors