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find the correct lang item for ranges

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This commit is contained in:
yukang 2022-10-03 04:22:59 +08:00
parent 5dd44d4d4c
commit e747201ad8
5 changed files with 109 additions and 69 deletions
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3
compiler/rustc_error_messages/locales/en-US/hir_analysis.ftl
View File

@ -133,8 +133,7 @@ hir_analysis_extern_crate_not_idiomatic =
.suggestion = convert it to a `{$msg_code}`
hir_analysis_expected_used_symbol = expected `used`, `used(compiler)` or `used(linker)`
hir_analysis_expected_used_symbol = expected `used`, `used(compiler)` or `used(linker)`
hir_analysis_missing_parentheses_in_range = `{$ty_str}` is not an iterator
hir_analysis_missing_parentheses_in_range = can't call method `{$method_name}` on type `{$ty_str}`
hir_analysis_add_missing_parentheses_in_range = you must surround the range in parentheses to call the `{$func_name}` function

62
compiler/rustc_hir_analysis/src/check/method/suggest.rs
View File

@ -13,7 +13,7 @@
use rustc_hir::def::DefKind;
use rustc_hir::def_id::DefId;
use rustc_hir::lang_items::LangItem;
use rustc_hir::{is_range_literal, ExprKind, Node, QPath};
use rustc_hir::{ExprKind, Node, QPath};
use rustc_infer::infer::type_variable::{TypeVariableOrigin, TypeVariableOriginKind};
use rustc_middle::traits::util::supertraits;
use rustc_middle::ty::fast_reject::{simplify_type, TreatParams};
@ -1214,17 +1214,35 @@ fn suggest_range_for_iter(
ty_str: &str,
) -> bool {
if let SelfSource::MethodCall(expr) = source {
let mut search_limit = 5;
for (_, parent) in tcx.hir().parent_iter(expr.hir_id) {
search_limit -= 1;
if search_limit == 0 {
break;
for (_, parent) in tcx.hir().parent_iter(expr.hir_id).take(5) {
if let Node::Expr(parent_expr) = parent {
let lang_item = match parent_expr.kind {
ExprKind::Struct(ref qpath, _, _) => match **qpath {
QPath::LangItem(LangItem::Range, ..) => Some(LangItem::Range),
QPath::LangItem(LangItem::RangeTo, ..) => Some(LangItem::RangeTo),
QPath::LangItem(LangItem::RangeToInclusive, ..) => {
Some(LangItem::RangeToInclusive)
}
_ => None,
},
ExprKind::Call(ref func, _) => match func.kind {
// `..=` desugars into `::std::ops::RangeInclusive::new(...)`.
ExprKind::Path(QPath::LangItem(LangItem::RangeInclusiveNew, ..)) => {
Some(LangItem::RangeInclusiveStruct)
}
_ => None,
},
_ => None,
};
if lang_item.is_none() {
continue;
}
if let Node::Expr(parent_expr) = parent && is_range_literal(parent_expr) {
let span_included = match parent_expr.kind {
hir::ExprKind::Struct(_, eps, _) =>
eps.len() > 0 && eps.last().map_or(false, |ep| ep.span.contains(span)),
hir::ExprKind::Struct(_, eps, _) => {
eps.len() > 0 && eps.last().map_or(false, |ep| ep.span.contains(span))
}
// `..=` desugars into `::std::ops::RangeInclusive::new(...)`.
hir::ExprKind::Call(ref func, ..) => func.span.contains(span),
_ => false,
@ -1234,30 +1252,24 @@ fn suggest_range_for_iter(
continue;
}
let range_def_id = self.tcx.lang_items().range_struct().unwrap();
let range_ty = self.tcx.bound_type_of(range_def_id).subst(self.tcx, &[actual.into()]);
// avoid suggesting when the method name is not implemented for a `range`
let pick = self.lookup_probe(
span,
item_name,
range_ty,
expr,
ProbeScope::AllTraits
);
debug!("lang_item: {:?}", lang_item);
let range_def_id = self.tcx.require_lang_item(lang_item.unwrap(), None);
let range_ty =
self.tcx.bound_type_of(range_def_id).subst(self.tcx, &[actual.into()]);
let pick =
self.lookup_probe(span, item_name, range_ty, expr, ProbeScope::AllTraits);
if pick.is_ok() {
let range_span = parent_expr.span.with_hi(expr.span.hi());
tcx.sess.emit_err(errors::MissingParentheseInRange {
span: span,
span,
ty_str: ty_str.to_string(),
add_missing_parentheses: Some(
errors::AddMissingParenthesesInRange {
method_name: item_name.as_str().to_string(),
add_missing_parentheses: Some(errors::AddMissingParenthesesInRange {
func_name: item_name.name.as_str().to_string(),
left: range_span.shrink_to_lo(),
right: range_span.shrink_to_hi(),
}
)
}),
});
return true;
}

3
compiler/rustc_hir_analysis/src/errors.rs
View File

@ -348,12 +348,13 @@ pub struct ExpectedUsedSymbol {
}
#[derive(Diagnostic)]
#[diag(hir_analysis::missing_parentheses_in_range, code = "E0599")]
#[diag(hir_analysis::missing_parentheses_in_range, code = "E0689")]
pub struct MissingParentheseInRange {
#[primary_span]
#[label(hir_analysis::missing_parentheses_in_range)]
pub span: Span,
pub ty_str: String,
pub method_name: String,
#[subdiagnostic]
pub add_missing_parentheses: Option<AddMissingParenthesesInRange>,

28
src/test/ui/methods/issues/issue-90315.rs
View File

@ -2,7 +2,7 @@
fn main() {
let arr = &[0, 1, 2, 3];
for _i in 0..arr.len().rev() {
//~^ ERROR not an iterator
//~^ ERROR can't call method
//~| surround the range in parentheses
// The above error used to say “the method `rev` exists for type `usize`”.
// This regression test ensures it doesn't say that any more.
@ -10,40 +10,40 @@ fn main() {
// Test for #102396
for i in 1..11.rev() {
//~^ ERROR not an iterator
//~^ ERROR can't call method
//~| HELP surround the range in parentheses
}
let end: usize = 10;
for i in 1..end.rev() {
//~^ ERROR not an iterator
//~^ ERROR can't call method
//~| HELP surround the range in parentheses
}
for i in 1..(end + 1).rev() {
//~^ ERROR not an iterator
//~^ ERROR can't call method
//~| HELP surround the range in parentheses
}
if 1..(end + 1).is_empty() {
//~^ ERROR not an iterator
//~^ ERROR can't call method
//~| ERROR mismatched types [E0308]
//~| HELP surround the range in parentheses
}
if 1..(end + 1).is_sorted() {
//~^ ERROR mismatched types [E0308]
//~| ERROR `usize` is not an iterator [E0599]
//~| ERROR can't call method
//~| HELP surround the range in parentheses
}
let _res: i32 = 3..6.take(2).sum();
//~^ ERROR `{integer}` is not an iterator [E0599]
//~^ ERROR can't call method
//~| ERROR mismatched types [E0308]
//~| HELP surround the range in parentheses
let _sum: i32 = 3..6.sum();
//~^ ERROR `{integer}` is not an iterator [E0599]
//~^ ERROR can't call method
//~| ERROR mismatched types [E0308]
//~| HELP surround the range in parentheses
@ -51,12 +51,12 @@ fn main() {
let b = 10 as usize;
for _a in a..=b.rev() {
//~^ ERROR not an iterator
//~^ ERROR can't call method
//~| HELP surround the range in parentheses
}
let _res = ..10.contains(3);
//~^ ERROR not an iterator
//~^ ERROR can't call method
//~| HELP surround the range in parentheses
if 1..end.error_method() {
@ -66,5 +66,11 @@ fn main() {
}
let _res = b.take(1)..a;
//~^ ERROR not an iterator
//~^ ERROR `usize` is not an iterator
let _res: i32 = ..6.take(2).sum();
//~^ can't call method `take` on ambiguous numeric type
//~| ERROR mismatched types [E0308]
//~| HELP you must specify a concrete type for this numeric value
// Won't suggest because `RangeTo` dest not implemented `take`
}

66
src/test/ui/methods/issues/issue-90315.stderr
View File

@ -1,52 +1,52 @@
error[E0599]: `usize` is not an iterator
error[E0689]: can't call method `rev` on type `usize`
--> $DIR/issue-90315.rs:4:28
|
LL | for _i in 0..arr.len().rev() {
| ^^^ `usize` is not an iterator
| ^^^ can't call method `rev` on type `usize`
|
help: you must surround the range in parentheses to call the `rev` function
|
LL | for _i in (0..arr.len()).rev() {
| + +
error[E0599]: `{integer}` is not an iterator
error[E0689]: can't call method `rev` on type `{integer}`
--> $DIR/issue-90315.rs:12:20
|
LL | for i in 1..11.rev() {
| ^^^ `{integer}` is not an iterator
| ^^^ can't call method `rev` on type `{integer}`
|
help: you must surround the range in parentheses to call the `rev` function
|
LL | for i in (1..11).rev() {
| + +
error[E0599]: `usize` is not an iterator
error[E0689]: can't call method `rev` on type `usize`
--> $DIR/issue-90315.rs:18:21
|
LL | for i in 1..end.rev() {
| ^^^ `usize` is not an iterator
| ^^^ can't call method `rev` on type `usize`
|
help: you must surround the range in parentheses to call the `rev` function
|
LL | for i in (1..end).rev() {
| + +
error[E0599]: `usize` is not an iterator
error[E0689]: can't call method `rev` on type `usize`
--> $DIR/issue-90315.rs:23:27
|
LL | for i in 1..(end + 1).rev() {
| ^^^ `usize` is not an iterator
| ^^^ can't call method `rev` on type `usize`
|
help: you must surround the range in parentheses to call the `rev` function
|
LL | for i in (1..(end + 1)).rev() {
| + +
error[E0599]: `usize` is not an iterator
error[E0689]: can't call method `is_empty` on type `usize`
--> $DIR/issue-90315.rs:28:21
|
LL | if 1..(end + 1).is_empty() {
| ^^^^^^^^ `usize` is not an iterator
| ^^^^^^^^ can't call method `is_empty` on type `usize`
|
help: you must surround the range in parentheses to call the `is_empty` function
|
@ -62,11 +62,11 @@ LL | if 1..(end + 1).is_empty() {
= note: expected type `bool`
found struct `std::ops::Range<{integer}>`
error[E0599]: `usize` is not an iterator
error[E0689]: can't call method `is_sorted` on type `usize`
--> $DIR/issue-90315.rs:34:21
|
LL | if 1..(end + 1).is_sorted() {
| ^^^^^^^^^ `usize` is not an iterator
| ^^^^^^^^^ can't call method `is_sorted` on type `usize`
|
help: you must surround the range in parentheses to call the `is_sorted` function
|
@ -82,11 +82,11 @@ LL | if 1..(end + 1).is_sorted() {
= note: expected type `bool`
found struct `std::ops::Range<{integer}>`
error[E0599]: `{integer}` is not an iterator
error[E0689]: can't call method `take` on type `{integer}`
--> $DIR/issue-90315.rs:40:26
|
LL | let _res: i32 = 3..6.take(2).sum();
| ^^^^ `{integer}` is not an iterator
| ^^^^ can't call method `take` on type `{integer}`
|
help: you must surround the range in parentheses to call the `take` function
|
@ -104,11 +104,11 @@ LL | let _res: i32 = 3..6.take(2).sum();
= note: expected type `i32`
found struct `std::ops::Range<{integer}>`
error[E0599]: `{integer}` is not an iterator
error[E0689]: can't call method `sum` on type `{integer}`
--> $DIR/issue-90315.rs:45:26
|
LL | let _sum: i32 = 3..6.sum();
| ^^^ `{integer}` is not an iterator
| ^^^ can't call method `sum` on type `{integer}`
|
help: you must surround the range in parentheses to call the `sum` function
|
@ -126,22 +126,22 @@ LL | let _sum: i32 = 3..6.sum();
= note: expected type `i32`
found struct `std::ops::Range<{integer}>`
error[E0599]: `usize` is not an iterator
error[E0689]: can't call method `rev` on type `usize`
--> $DIR/issue-90315.rs:53:21
|
LL | for _a in a..=b.rev() {
| ^^^ `usize` is not an iterator
| ^^^ can't call method `rev` on type `usize`
|
help: you must surround the range in parentheses to call the `rev` function
|
LL | for _a in (a..=b).rev() {
| + +
error[E0599]: `{integer}` is not an iterator
error[E0689]: can't call method `contains` on type `{integer}`
--> $DIR/issue-90315.rs:58:21
|
LL | let _res = ..10.contains(3);
| ^^^^^^^^ `{integer}` is not an iterator
| ^^^^^^^^ can't call method `contains` on type `{integer}`
|
help: you must surround the range in parentheses to call the `contains` function
|
@ -173,7 +173,29 @@ LL | let _res = b.take(1)..a;
`usize: Iterator`
which is required by `&mut usize: Iterator`
error: aborting due to 17 previous errors
error[E0689]: can't call method `take` on ambiguous numeric type `{integer}`
--> $DIR/issue-90315.rs:71:25
|
LL | let _res: i32 = ..6.take(2).sum();
| ^^^^
|
help: you must specify a concrete type for this numeric value, like `i32`
|
LL | let _res: i32 = ..6_i32.take(2).sum();
| ~~~~~
Some errors have detailed explanations: E0308, E0599.
error[E0308]: mismatched types
--> $DIR/issue-90315.rs:71:21
|
LL | let _res: i32 = ..6.take(2).sum();
| --- ^^^^^^^^^^^^^^^^^ expected `i32`, found struct `RangeTo`
| |
| expected due to this
|
= note: expected type `i32`
found struct `RangeTo<_>`
error: aborting due to 19 previous errors
Some errors have detailed explanations: E0308, E0599, E0689.
For more information about an error, try `rustc --explain E0308`.