Detect more cases of = to : typo
When a `Local` is fully parsed, but not followed by a `;`, keep the `:` span
arround and mention it. If the type could continue being parsed as an
expression, suggest replacing the `:` with a `=`.
```
error: expected one of `!`, `+`, `->`, `::`, `;`, or `=`, found `.`
--> file.rs:2:32
|
2 | let _: std::env::temp_dir().join("foo");
| - ^ expected one of `!`, `+`, `->`, `::`, `;`, or `=`
| |
| while parsing the type for `_`
| help: use `=` if you meant to assign
```
Fix #119665.
This commit is contained in:
Esteban Küber
parent
c475e2303b
commit
bde2dfb127
@ -670,6 +670,16 @@ pub fn contains_never_pattern(&self) -> bool {
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});
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contains_never_pattern
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}
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/// Return a name suitable for diagnostics.
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pub fn descr(&self) -> Option<String> {
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match &self.kind {
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PatKind::Wild => Some("_".to_string()),
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PatKind::Ident(BindingAnnotation::NONE, ident, None) => Some(format!("{ident}")),
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PatKind::Ref(pat, mutbl) => pat.descr().map(|d| format!("&{}{d}", mutbl.prefix_str())),
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_ => None,
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}
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}
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}
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/// A single field in a struct pattern.
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@ -1052,6 +1062,7 @@ pub struct Local {
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pub ty: Option<P<Ty>>,
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pub kind: LocalKind,
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pub span: Span,
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pub colon_sp: Option<Span>,
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pub attrs: AttrVec,
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pub tokens: Option<LazyAttrTokenStream>,
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}
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@ -3325,7 +3336,7 @@ mod size_asserts {
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static_assert_size!(Item, 136);
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static_assert_size!(ItemKind, 64);
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static_assert_size!(LitKind, 24);
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static_assert_size!(Local, 72);
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static_assert_size!(Local, 80);
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static_assert_size!(MetaItemLit, 40);
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static_assert_size!(Param, 40);
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static_assert_size!(Pat, 72);
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@ -609,7 +609,7 @@ pub fn noop_visit_parenthesized_parameter_data<T: MutVisitor>(
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}
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pub fn noop_visit_local<T: MutVisitor>(local: &mut P<Local>, vis: &mut T) {
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let Local { id, pat, ty, kind, span, attrs, tokens } = local.deref_mut();
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let Local { id, pat, ty, kind, span, colon_sp, attrs, tokens } = local.deref_mut();
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vis.visit_id(id);
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vis.visit_pat(pat);
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visit_opt(ty, |ty| vis.visit_ty(ty));
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@ -624,6 +624,7 @@ pub fn noop_visit_local<T: MutVisitor>(local: &mut P<Local>, vis: &mut T) {
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}
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}
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vis.visit_span(span);
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visit_opt(colon_sp, |sp| vis.visit_span(sp));
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visit_attrs(attrs, vis);
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visit_lazy_tts(tokens, vis);
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}
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@ -165,6 +165,7 @@ pub fn stmt_let_pat(&self, sp: Span, pat: P<ast::Pat>, ex: P<ast::Expr>) -> ast:
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id: ast::DUMMY_NODE_ID,
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kind: LocalKind::Init(ex),
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span: sp,
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colon_sp: None,
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attrs: AttrVec::new(),
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tokens: None,
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});
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@ -194,6 +195,7 @@ pub fn stmt_let_ty(
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id: ast::DUMMY_NODE_ID,
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kind: LocalKind::Init(ex),
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span: sp,
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colon_sp: None,
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attrs: AttrVec::new(),
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tokens: None,
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});
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@ -208,6 +210,7 @@ pub fn stmt_let_type_only(&self, span: Span, ty: P<ast::Ty>) -> ast::Stmt {
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id: ast::DUMMY_NODE_ID,
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kind: LocalKind::Decl,
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span,
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colon_sp: None,
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attrs: AttrVec::new(),
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tokens: None,
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});
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@ -430,7 +430,7 @@ fn error_found_expr_would_be_stmt(&self, lhs: &Expr) {
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/// The method does not advance the current token.
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///
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/// Also performs recovery for `and` / `or` which are mistaken for `&&` and `||` respectively.
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fn check_assoc_op(&self) -> Option<Spanned<AssocOp>> {
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pub fn check_assoc_op(&self) -> Option<Spanned<AssocOp>> {
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let (op, span) = match (AssocOp::from_token(&self.token), self.token.ident()) {
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// When parsing const expressions, stop parsing when encountering `>`.
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(
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@ -994,7 +994,7 @@ fn parse_expr_dot_or_call_with_(&mut self, mut e: P<Expr>, lo: Span) -> PResult<
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}
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}
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fn parse_dot_suffix_expr(&mut self, lo: Span, base: P<Expr>) -> PResult<'a, P<Expr>> {
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pub fn parse_dot_suffix_expr(&mut self, lo: Span, base: P<Expr>) -> PResult<'a, P<Expr>> {
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match self.token.uninterpolate().kind {
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token::Ident(..) => self.parse_dot_suffix(base, lo),
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token::Literal(token::Lit { kind: token::Integer, symbol, suffix }) => {
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@ -294,17 +294,22 @@ fn parse_local(&mut self, attrs: AttrVec) -> PResult<'a, P<Local>> {
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let (pat, colon) =
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self.parse_pat_before_ty(None, RecoverComma::Yes, PatternLocation::LetBinding)?;
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let (err, ty) = if colon {
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let (err, ty, colon_sp) = if colon {
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// Save the state of the parser before parsing type normally, in case there is a `:`
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// instead of an `=` typo.
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let parser_snapshot_before_type = self.clone();
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let colon_sp = self.prev_token.span;
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match self.parse_ty() {
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Ok(ty) => (None, Some(ty)),
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Ok(ty) => (None, Some(ty), Some(colon_sp)),
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Err(mut err) => {
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if let Ok(snip) = self.span_to_snippet(pat.span) {
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err.span_label(pat.span, format!("while parsing the type for `{snip}`"));
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}
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err.span_label(
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colon_sp,
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format!(
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"while parsing the type for {}",
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pat.descr()
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.map_or_else(|| "the binding".to_string(), |n| format!("`{n}`"))
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),
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);
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// we use noexpect here because we don't actually expect Eq to be here
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// but we are still checking for it in order to be able to handle it if
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// it is there
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@ -317,11 +322,11 @@ fn parse_local(&mut self, attrs: AttrVec) -> PResult<'a, P<Local>> {
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mem::replace(self, parser_snapshot_before_type);
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Some((parser_snapshot_after_type, colon_sp, err))
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};
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(err, None)
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(err, None, Some(colon_sp))
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}
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}
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} else {
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(None, None)
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(None, None, None)
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};
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let init = match (self.parse_initializer(err.is_some()), err) {
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(Ok(init), None) => {
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@ -380,7 +385,16 @@ fn parse_local(&mut self, attrs: AttrVec) -> PResult<'a, P<Local>> {
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}
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};
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let hi = if self.token == token::Semi { self.token.span } else { self.prev_token.span };
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Ok(P(ast::Local { ty, pat, kind, id: DUMMY_NODE_ID, span: lo.to(hi), attrs, tokens: None }))
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Ok(P(ast::Local {
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ty,
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pat,
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kind,
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id: DUMMY_NODE_ID,
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span: lo.to(hi),
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colon_sp,
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attrs,
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tokens: None,
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}))
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}
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fn check_let_else_init_bool_expr(&self, init: &ast::Expr) {
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@ -750,7 +764,7 @@ pub fn parse_full_stmt(
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}
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}
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StmtKind::Expr(_) | StmtKind::MacCall(_) => {}
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StmtKind::Local(local) if let Err(e) = self.expect_semi() => {
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StmtKind::Local(local) if let Err(mut e) = self.expect_semi() => {
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// We might be at the `,` in `let x = foo<bar, baz>;`. Try to recover.
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match &mut local.kind {
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LocalKind::Init(expr) | LocalKind::InitElse(expr, _) => {
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@ -758,7 +772,47 @@ pub fn parse_full_stmt(
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// We found `foo<bar, baz>`, have we fully recovered?
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self.expect_semi()?;
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}
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LocalKind::Decl => return Err(e),
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LocalKind::Decl => {
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if let Some(colon_sp) = local.colon_sp {
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e.span_label(
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colon_sp,
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format!(
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"while parsing the type for {}",
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local.pat.descr().map_or_else(
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|| "the binding".to_string(),
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|n| format!("`{n}`")
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)
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),
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);
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let suggest_eq = if self.token.kind == token::Dot
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&& let _ = self.bump()
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&& let mut snapshot = self.create_snapshot_for_diagnostic()
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&& let Ok(_) = snapshot.parse_dot_suffix_expr(
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colon_sp,
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self.mk_expr_err(
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colon_sp,
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self.dcx().delayed_bug("error during `:` -> `=` recovery"),
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),
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) {
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true
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} else if let Some(op) = self.check_assoc_op()
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&& op.node.can_continue_expr_unambiguously()
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{
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true
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} else {
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false
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};
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if suggest_eq {
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e.span_suggestion_short(
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colon_sp,
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"use `=` if you meant to assign",
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"=",
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Applicability::MaybeIncorrect,
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);
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}
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}
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return Err(e);
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}
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}
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eat_semi = false;
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}
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@ -146,9 +146,9 @@ error: expected one of `,` or `>`, found `0`
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--> $DIR/bad-const-generic-exprs.rs:43:17
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|
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LL | let _: Wow<!0>;
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| - ^ expected one of `,` or `>`
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| |
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| while parsing the type for `_`
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| - ^ expected one of `,` or `>`
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| |
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| while parsing the type for `_`
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|
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help: you might have meant to end the type parameters here
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|
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@ -2,9 +2,9 @@ error: expected one of `,`, `:`, or `>`, found `=`
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--> $DIR/issue-34334.rs:2:29
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|
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LL | let sr: Vec<(u32, _, _) = vec![];
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| -- ^ expected one of `,`, `:`, or `>`
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| |
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| while parsing the type for `sr`
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| - ^ expected one of `,`, `:`, or `>`
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| |
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| while parsing the type for `sr`
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|
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help: you might have meant to end the type parameters here
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|
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@ -2,9 +2,9 @@ error: expected one of `!`, `(`, `+`, `::`, `;`, `<`, or `]`, found `3`
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--> $DIR/better-expected.rs:2:19
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|
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LL | let x: [isize 3];
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| - ^ expected one of 7 possible tokens
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| |
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| while parsing the type for `x`
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| - ^ expected one of 7 possible tokens
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| |
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| while parsing the type for `x`
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error: aborting due to 1 previous error
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@ -2,9 +2,9 @@ error: expected one of `>`, a const expression, lifetime, or type, found `}`
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--> $DIR/issue-84117.rs:2:67
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|
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LL | let outer_local:e_outer<&str, { let inner_local:e_inner<&str, }
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| ----------- ^ expected one of `>`, a const expression, lifetime, or type
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| |
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| while parsing the type for `inner_local`
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| - ^ expected one of `>`, a const expression, lifetime, or type
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| |
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| while parsing the type for `inner_local`
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|
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help: you might have meant to end the type parameters here
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|
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@ -25,7 +25,7 @@ error: expected one of `,` or `>`, found `}`
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--> $DIR/issue-84117.rs:8:1
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|
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LL | let outer_local:e_outer<&str, { let inner_local:e_inner<&str, }
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| ----------- while parsing the type for `outer_local` - expected one of `,` or `>`
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| - while parsing the type for `outer_local` - expected one of `,` or `>`
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...
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LL | }
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| ^ unexpected token
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@ -43,9 +43,9 @@ error: expected one of `>`, a const expression, lifetime, or type, found `}`
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--> $DIR/issue-84117.rs:2:67
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|
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LL | let outer_local:e_outer<&str, { let inner_local:e_inner<&str, }
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| ----------- ^ expected one of `>`, a const expression, lifetime, or type
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| |
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| while parsing the type for `inner_local`
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| - ^ expected one of `>`, a const expression, lifetime, or type
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| |
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| while parsing the type for `inner_local`
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|
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= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
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help: you might have meant to end the type parameters here
|
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|
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@ -2,9 +2,9 @@ error: expected one of `,`, `:`, or `>`, found `=`
|
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--> $DIR/missing-closing-angle-bracket-eq-constraint.rs:7:23
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|
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LL | let v : Vec<(u32,_) = vec![];
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| - ^ expected one of `,`, `:`, or `>`
|
||||
| |
|
||||
| while parsing the type for `v`
|
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| - ^ expected one of `,`, `:`, or `>`
|
||||
| |
|
||||
| while parsing the type for `v`
|
||||
|
|
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help: you might have meant to end the type parameters here
|
||||
|
|
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@ -15,9 +15,9 @@ error: expected one of `!`, `(`, `+`, `,`, `::`, `<`, or `>`, found `{`
|
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--> $DIR/missing-closing-angle-bracket-eq-constraint.rs:13:32
|
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|
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LL | let foo : Foo::<T1, T2 = Foo {_a : arg1, _b : arg2};
|
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| --- ^ expected one of 7 possible tokens
|
||||
| |
|
||||
| while parsing the type for `foo`
|
||||
| - ^ expected one of 7 possible tokens
|
||||
| |
|
||||
| while parsing the type for `foo`
|
||||
|
|
||||
help: you might have meant to end the type parameters here
|
||||
|
|
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@ -28,9 +28,9 @@ error: expected one of `,`, `:`, or `>`, found `=`
|
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--> $DIR/missing-closing-angle-bracket-eq-constraint.rs:18:18
|
||||
|
|
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LL | let v : Vec<'a = vec![];
|
||||
| - ^ expected one of `,`, `:`, or `>`
|
||||
| |
|
||||
| while parsing the type for `v`
|
||||
| - ^ expected one of `,`, `:`, or `>`
|
||||
| |
|
||||
| while parsing the type for `v`
|
||||
|
|
||||
help: you might have meant to end the type parameters here
|
||||
|
|
||||
|
||||
@ -2,7 +2,7 @@ error: expected one of `,` or `>`, found `;`
|
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--> $DIR/nested-missing-closing-angle-bracket.rs:2:46
|
||||
|
|
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LL | let v : Vec::<Vec<(u32,_,_)> = vec![vec![]];
|
||||
| - while parsing the type for `v` ^ expected one of `,` or `>`
|
||||
| - while parsing the type for `v` ^ expected one of `,` or `>`
|
||||
|
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error: aborting due to 1 previous error
|
||||
|
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|
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@ -0,0 +1,3 @@
|
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fn main() {
|
||||
let _: std::env::temp_dir().join("foo"); //~ ERROR expected one of
|
||||
}
|
||||
@ -0,0 +1,11 @@
|
||||
error: expected one of `!`, `+`, `->`, `::`, `;`, or `=`, found `.`
|
||||
--> $DIR/recover-colon-instead-of-eq-in-local.rs:2:32
|
||||
|
|
||||
LL | let _: std::env::temp_dir().join("foo");
|
||||
| - ^ expected one of `!`, `+`, `->`, `::`, `;`, or `=`
|
||||
| |
|
||||
| while parsing the type for `_`
|
||||
| help: use `=` if you meant to assign
|
||||
|
||||
error: aborting due to 1 previous error
|
||||
|
||||
@ -8,7 +8,9 @@ error: expected one of `->`, `;`, or `=`, found `~`
|
||||
--> $DIR/removed-syntax-fn-sigil.rs:2:14
|
||||
|
|
||||
LL | let x: fn~() = || ();
|
||||
| ^ expected one of `->`, `;`, or `=`
|
||||
| - ^ expected one of `->`, `;`, or `=`
|
||||
| |
|
||||
| while parsing the type for `x`
|
||||
|
||||
error: aborting due to 2 previous errors
|
||||
|
||||
|
||||
@ -2,7 +2,9 @@ error: expected one of `!`, `(`, `+`, `::`, `;`, `<`, or `=`, found `@`
|
||||
--> $DIR/nested-type-ascription-syntactically-invalid.rs:18:15
|
||||
|
|
||||
LL | let a: u8 @ b = 0;
|
||||
| ^ expected one of 7 possible tokens
|
||||
| - ^ expected one of 7 possible tokens
|
||||
| |
|
||||
| while parsing the type for `a`
|
||||
|
||||
error: expected one of `)`, `,`, `@`, or `|`, found `:`
|
||||
--> $DIR/nested-type-ascription-syntactically-invalid.rs:24:15
|
||||
@ -16,7 +18,9 @@ error: expected one of `!`, `(`, `+`, `::`, `;`, `<`, or `=`, found `@`
|
||||
--> $DIR/nested-type-ascription-syntactically-invalid.rs:30:15
|
||||
|
|
||||
LL | let a: T1 @ Outer(b: T2);
|
||||
| ^ expected one of 7 possible tokens
|
||||
| - ^ expected one of 7 possible tokens
|
||||
| |
|
||||
| while parsing the type for `a`
|
||||
|
||||
error: aborting due to 3 previous errors
|
||||
|
||||
|
||||
@ -10,16 +10,16 @@ ast-stats-1 - BoundPredicate 56 ( 0.8%) 1
|
||||
ast-stats-1 Attribute 64 ( 1.0%) 2 32
|
||||
ast-stats-1 - Normal 32 ( 0.5%) 1
|
||||
ast-stats-1 - DocComment 32 ( 0.5%) 1
|
||||
ast-stats-1 Local 72 ( 1.1%) 1 72
|
||||
ast-stats-1 Arm 96 ( 1.5%) 2 48
|
||||
ast-stats-1 ForeignItem 96 ( 1.5%) 1 96
|
||||
ast-stats-1 - Fn 96 ( 1.5%) 1
|
||||
ast-stats-1 Local 80 ( 1.2%) 1 80
|
||||
ast-stats-1 Arm 96 ( 1.4%) 2 48
|
||||
ast-stats-1 ForeignItem 96 ( 1.4%) 1 96
|
||||
ast-stats-1 - Fn 96 ( 1.4%) 1
|
||||
ast-stats-1 FnDecl 120 ( 1.8%) 5 24
|
||||
ast-stats-1 FieldDef 160 ( 2.4%) 2 80
|
||||
ast-stats-1 Stmt 160 ( 2.4%) 5 32
|
||||
ast-stats-1 - Local 32 ( 0.5%) 1
|
||||
ast-stats-1 - MacCall 32 ( 0.5%) 1
|
||||
ast-stats-1 - Expr 96 ( 1.5%) 3
|
||||
ast-stats-1 - Expr 96 ( 1.4%) 3
|
||||
ast-stats-1 Param 160 ( 2.4%) 4 40
|
||||
ast-stats-1 Block 192 ( 2.9%) 6 32
|
||||
ast-stats-1 Variant 208 ( 3.1%) 2 104
|
||||
@ -28,7 +28,7 @@ ast-stats-1 - Trait 352 ( 5.3%) 4
|
||||
ast-stats-1 AssocItem 352 ( 5.3%) 4 88
|
||||
ast-stats-1 - Type 176 ( 2.7%) 2
|
||||
ast-stats-1 - Fn 176 ( 2.7%) 2
|
||||
ast-stats-1 GenericParam 480 ( 7.3%) 5 96
|
||||
ast-stats-1 GenericParam 480 ( 7.2%) 5 96
|
||||
ast-stats-1 Pat 504 ( 7.6%) 7 72
|
||||
ast-stats-1 - Struct 72 ( 1.1%) 1
|
||||
ast-stats-1 - Wild 72 ( 1.1%) 1
|
||||
@ -53,7 +53,7 @@ ast-stats-1 - Impl 136 ( 2.1%) 1
|
||||
ast-stats-1 - Fn 272 ( 4.1%) 2
|
||||
ast-stats-1 - Use 408 ( 6.2%) 3
|
||||
ast-stats-1 ----------------------------------------------------------------
|
||||
ast-stats-1 Total 6_616
|
||||
ast-stats-1 Total 6_624
|
||||
ast-stats-1
|
||||
ast-stats-2 POST EXPANSION AST STATS
|
||||
ast-stats-2 Name Accumulated Size Count Item Size
|
||||
@ -64,7 +64,7 @@ ast-stats-2 Crate 40 ( 0.6%) 1 40
|
||||
ast-stats-2 ExprField 48 ( 0.7%) 1 48
|
||||
ast-stats-2 WherePredicate 56 ( 0.8%) 1 56
|
||||
ast-stats-2 - BoundPredicate 56 ( 0.8%) 1
|
||||
ast-stats-2 Local 72 ( 1.0%) 1 72
|
||||
ast-stats-2 Local 80 ( 1.1%) 1 80
|
||||
ast-stats-2 Arm 96 ( 1.3%) 2 48
|
||||
ast-stats-2 ForeignItem 96 ( 1.3%) 1 96
|
||||
ast-stats-2 - Fn 96 ( 1.3%) 1
|
||||
@ -86,7 +86,7 @@ ast-stats-2 - Trait 352 ( 4.9%) 4
|
||||
ast-stats-2 AssocItem 352 ( 4.9%) 4 88
|
||||
ast-stats-2 - Type 176 ( 2.4%) 2
|
||||
ast-stats-2 - Fn 176 ( 2.4%) 2
|
||||
ast-stats-2 GenericParam 480 ( 6.7%) 5 96
|
||||
ast-stats-2 GenericParam 480 ( 6.6%) 5 96
|
||||
ast-stats-2 Pat 504 ( 7.0%) 7 72
|
||||
ast-stats-2 - Struct 72 ( 1.0%) 1
|
||||
ast-stats-2 - Wild 72 ( 1.0%) 1
|
||||
@ -113,7 +113,7 @@ ast-stats-2 - Impl 136 ( 1.9%) 1
|
||||
ast-stats-2 - Fn 272 ( 3.8%) 2
|
||||
ast-stats-2 - Use 544 ( 7.5%) 4
|
||||
ast-stats-2 ----------------------------------------------------------------
|
||||
ast-stats-2 Total 7_216
|
||||
ast-stats-2 Total 7_224
|
||||
ast-stats-2
|
||||
hir-stats HIR STATS
|
||||
hir-stats Name Accumulated Size Count Item Size
|
||||
|
||||
@ -2,10 +2,10 @@ error: expected type, found `10`
|
||||
--> $DIR/type-ascription-instead-of-initializer.rs:2:31
|
||||
|
|
||||
LL | let x: Vec::with_capacity(10, 20);
|
||||
| -- ^^ expected type
|
||||
| ||
|
||||
| |help: use `=` if you meant to assign
|
||||
| while parsing the type for `x`
|
||||
| - ^^ expected type
|
||||
| |
|
||||
| while parsing the type for `x`
|
||||
| help: use `=` if you meant to assign
|
||||
|
||||
error[E0061]: this function takes 1 argument but 2 arguments were supplied
|
||||
--> $DIR/type-ascription-instead-of-initializer.rs:2:12
|
||||
|
||||
Loading…
Reference in New Issue
Block a user