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GuillaumeGomezGuillaumeGomez
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Rollup merge of rust-lang#140671 - xizheyin:issue-140169, r=petrochenkov
Parser: Recover error from named params while parse_path Fixes rust-lang#140169 I added test to the first commit and the second added the code and changes to test. r? `@petrochenkov`
2 parents f7a9c67 + b922da3 commit 32325e1

10 files changed

+167
-58
lines changed

‎compiler/rustc_parse/messages.ftl

Lines changed: 10 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -715,6 +715,16 @@ parse_parenthesized_lifetime_suggestion = remove the parentheses
715715
parse_path_double_colon = path separator must be a double colon
716716
.suggestion = use a double colon instead
717717
718+
719+
parse_path_found_attribute_in_params = `Trait(...)` syntax does not support attributes in parameters
720+
.suggestion = remove the attributes
721+
722+
parse_path_found_c_variadic_params = `Trait(...)` syntax does not support c_variadic parameters
723+
.suggestion = remove the `...`
724+
725+
parse_path_found_named_params = `Trait(...)` syntax does not support named parameters
726+
.suggestion = remove the parameter name
727+
718728
parse_pattern_method_param_without_body = patterns aren't allowed in methods without bodies
719729
.suggestion = give this argument a name or use an underscore to ignore it
720730

‎compiler/rustc_parse/src/errors.rs

Lines changed: 24 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1646,6 +1646,30 @@ pub(crate) struct ExpectedFnPathFoundFnKeyword {
16461646
pub fn_token_span: Span,
16471647
}
16481648

1649+
#[derive(Diagnostic)]
1650+
#[diag(parse_path_found_named_params)]
1651+
pub(crate) struct FnPathFoundNamedParams {
1652+
#[primary_span]
1653+
#[suggestion(applicability = "machine-applicable", code = "")]
1654+
pub named_param_span: Span,
1655+
}
1656+
1657+
#[derive(Diagnostic)]
1658+
#[diag(parse_path_found_c_variadic_params)]
1659+
pub(crate) struct PathFoundCVariadicParams {
1660+
#[primary_span]
1661+
#[suggestion(applicability = "machine-applicable", code = "")]
1662+
pub span: Span,
1663+
}
1664+
1665+
#[derive(Diagnostic)]
1666+
#[diag(parse_path_found_attribute_in_params)]
1667+
pub(crate) struct PathFoundAttributeInParams {
1668+
#[primary_span]
1669+
#[suggestion(applicability = "machine-applicable", code = "")]
1670+
pub span: Span,
1671+
}
1672+
16491673
#[derive(Diagnostic)]
16501674
#[diag(parse_path_double_colon)]
16511675
pub(crate) struct PathSingleColon {

‎compiler/rustc_parse/src/parser/item.rs

Lines changed: 11 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -2894,7 +2894,7 @@ impl<'a> Parser<'a> {
28942894
let (mut params, _) = self.parse_paren_comma_seq(|p| {
28952895
p.recover_vcs_conflict_marker();
28962896
let snapshot = p.create_snapshot_for_diagnostic();
2897-
let param = p.parse_param_general(req_name, first_param).or_else(|e| {
2897+
let param = p.parse_param_general(req_name, first_param, true).or_else(|e| {
28982898
let guar = e.emit();
28992899
// When parsing a param failed, we should check to make the span of the param
29002900
// not contain '(' before it.
@@ -2922,7 +2922,13 @@ impl<'a> Parser<'a> {
29222922
/// Parses a single function parameter.
29232923
///
29242924
/// - `self` is syntactically allowed when `first_param` holds.
2925-
fn parse_param_general(&mut self, req_name: ReqName, first_param: bool) -> PResult<'a, Param> {
2925+
/// - `recover_arg_parse` is used to recover from a failed argument parse.
2926+
pub(super) fn parse_param_general(
2927+
&mut self,
2928+
req_name: ReqName,
2929+
first_param: bool,
2930+
recover_arg_parse: bool,
2931+
) -> PResult<'a, Param> {
29262932
let lo = self.token.span;
29272933
let attrs = self.parse_outer_attributes()?;
29282934
self.collect_tokens(None, attrs, ForceCollect::No, |this, attrs| {
@@ -2990,12 +2996,13 @@ impl<'a> Parser<'a> {
29902996
// If this is a C-variadic argument and we hit an error, return the error.
29912997
Err(err) if this.token == token::DotDotDot => return Err(err),
29922998
Err(err) if this.unmatched_angle_bracket_count > 0 => return Err(err),
2993-
// Recover from attempting to parse the argument as a type without pattern.
2994-
Err(err) => {
2999+
Err(err) if recover_arg_parse => {
3000+
// Recover from attempting to parse the argument as a type without pattern.
29953001
err.cancel();
29963002
this.restore_snapshot(parser_snapshot_before_ty);
29973003
this.recover_arg_parse()?
29983004
}
3005+
Err(err) => return Err(err),
29993006
}
30003007
};
30013008

‎compiler/rustc_parse/src/parser/path.rs

Lines changed: 27 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -15,7 +15,11 @@ use tracing::debug;
1515

1616
use super::ty::{AllowPlus, RecoverQPath, RecoverReturnSign};
1717
use super::{Parser, Restrictions, TokenType};
18-
use crate::errors::{self, PathSingleColon, PathTripleColon};
18+
use crate::ast::{PatKind, TyKind};
19+
use crate::errors::{
20+
self, FnPathFoundNamedParams, PathFoundAttributeInParams, PathFoundCVariadicParams,
21+
PathSingleColon, PathTripleColon,
22+
};
1923
use crate::exp;
2024
use crate::parser::{CommaRecoveryMode, RecoverColon, RecoverComma};
2125

@@ -396,7 +400,28 @@ impl<'a> Parser<'a> {
396400
snapshot = Some(self.create_snapshot_for_diagnostic());
397401
}
398402

399-
let (inputs, _) = match self.parse_paren_comma_seq(|p| p.parse_ty()) {
403+
let dcx = self.dcx();
404+
let parse_params_result = self.parse_paren_comma_seq(|p| {
405+
let param = p.parse_param_general(|_| false, false, false);
406+
param.map(move |param| {
407+
if !matches!(param.pat.kind, PatKind::Missing) {
408+
dcx.emit_err(FnPathFoundNamedParams {
409+
named_param_span: param.pat.span,
410+
});
411+
}
412+
if matches!(param.ty.kind, TyKind::CVarArgs) {
413+
dcx.emit_err(PathFoundCVariadicParams { span: param.pat.span });
414+
}
415+
if !param.attrs.is_empty() {
416+
dcx.emit_err(PathFoundAttributeInParams {
417+
span: param.attrs[0].span,
418+
});
419+
}
420+
param.ty
421+
})
422+
});
423+
424+
let (inputs, _) = match parse_params_result {
400425
Ok(output) => output,
401426
Err(mut error) if prev_token_before_parsing == token::PathSep => {
402427
error.span_label(

‎tests/ui/fn/fn-trait-use-named-params-issue-140169.rs

Lines changed: 12 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,12 @@
1+
fn f1(_: fn(a: u8)) {}
2+
fn f2(_: impl Fn(u8, vvvv: u8)) {} //~ ERROR `Trait(...)` syntax does not support named parameters
3+
fn f3(_: impl Fn(aaaa: u8, u8)) {} //~ ERROR `Trait(...)` syntax does not support named parameters
4+
fn f4(_: impl Fn(aaaa: u8, vvvv: u8)) {}
5+
//~^ ERROR `Trait(...)` syntax does not support named parameters
6+
//~| ERROR `Trait(...)` syntax does not support named parameters
7+
fn f5(_: impl Fn(u8, ...)) {}
8+
//~^ ERROR `Trait(...)` syntax does not support c_variadic parameters
9+
fn f6(_: impl Fn(u8, #[allow(unused_attributes)] u8)) {}
10+
//~^ ERROR `Trait(...)` syntax does not support attributes in parameters
11+
12+
fn main(){}

‎tests/ui/fn/fn-trait-use-named-params-issue-140169.stderr

Lines changed: 38 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,38 @@
1+
error: `Trait(...)` syntax does not support named parameters
2+
--> $DIR/fn-trait-use-named-params-issue-140169.rs:2:22
3+
|
4+
LL | fn f2(_: impl Fn(u8, vvvv: u8)) {}
5+
| ^^^^ help: remove the parameter name
6+
7+
error: `Trait(...)` syntax does not support named parameters
8+
--> $DIR/fn-trait-use-named-params-issue-140169.rs:3:18
9+
|
10+
LL | fn f3(_: impl Fn(aaaa: u8, u8)) {}
11+
| ^^^^ help: remove the parameter name
12+
13+
error: `Trait(...)` syntax does not support named parameters
14+
--> $DIR/fn-trait-use-named-params-issue-140169.rs:4:18
15+
|
16+
LL | fn f4(_: impl Fn(aaaa: u8, vvvv: u8)) {}
17+
| ^^^^ help: remove the parameter name
18+
19+
error: `Trait(...)` syntax does not support named parameters
20+
--> $DIR/fn-trait-use-named-params-issue-140169.rs:4:28
21+
|
22+
LL | fn f4(_: impl Fn(aaaa: u8, vvvv: u8)) {}
23+
| ^^^^ help: remove the parameter name
24+
25+
error: `Trait(...)` syntax does not support c_variadic parameters
26+
--> $DIR/fn-trait-use-named-params-issue-140169.rs:7:22
27+
|
28+
LL | fn f5(_: impl Fn(u8, ...)) {}
29+
| ^^^ help: remove the `...`
30+
31+
error: `Trait(...)` syntax does not support attributes in parameters
32+
--> $DIR/fn-trait-use-named-params-issue-140169.rs:9:22
33+
|
34+
LL | fn f6(_: impl Fn(u8, #[allow(unused_attributes)] u8)) {}
35+
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attributes
36+
37+
error: aborting due to 6 previous errors
38+

‎tests/ui/parser/diagnostics-parenthesized-type-arguments-ice-issue-122345.rs

Lines changed: 5 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -2,8 +2,10 @@
22

33
fn main() {
44
unsafe {
5-
dealloc(ptr2, Layout::(x: !)(1, 1)); //~ ERROR: expected one of `!`, `(`, `)`, `+`, `,`, `::`, or `<`, found `:`
6-
//~^ ERROR: expected one of `.`, `;`, `?`, `}`, or an operator, found `)`
7-
//~| NOTE while parsing this parenthesized list of type arguments starting here
5+
dealloc(ptr2, Layout::(x: !)(1, 1)); //~ ERROR `Trait(...)` syntax does not support named parameters
6+
//~^ ERROR cannot find function `dealloc` in this scope [E0425]
7+
//~| ERROR cannot find value `ptr2` in this scope [E0425]
8+
//~| ERROR the `!` type is experimental [E0658]
9+
//~| ERROR cannot find function, tuple struct or tuple variant `Layout` in this scope [E0425]
810
}
911
}

‎tests/ui/parser/diagnostics-parenthesized-type-arguments-ice-issue-122345.stderr

Lines changed: 36 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -1,16 +1,43 @@
1-
error: expected one of `!`, `(`, `)`, `+`, `,`, `::`, or `<`, found `:`
2-
--> $DIR/diagnostics-parenthesized-type-arguments-ice-issue-122345.rs:5:33
1+
error: `Trait(...)` syntax does not support named parameters
2+
--> $DIR/diagnostics-parenthesized-type-arguments-ice-issue-122345.rs:5:32
33
|
44
LL | dealloc(ptr2, Layout::(x: !)(1, 1));
5-
| --- ^ expected one of 7 possible tokens
6-
| |
7-
| while parsing this parenthesized list of type arguments starting here
5+
| ^ help: remove the parameter name
86

9-
error: expected one of `.`, `;`, `?`, `}`, or an operator, found `)`
10-
--> $DIR/diagnostics-parenthesized-type-arguments-ice-issue-122345.rs:5:43
7+
error[E0425]: cannot find function `dealloc` in this scope
8+
--> $DIR/diagnostics-parenthesized-type-arguments-ice-issue-122345.rs:5:9
119
|
1210
LL | dealloc(ptr2, Layout::(x: !)(1, 1));
13-
| ^ expected one of `.`, `;`, `?`, `}`, or an operator
11+
| ^^^^^^^ not found in this scope
12+
|
13+
help: consider importing this function
14+
|
15+
LL + use std::alloc::dealloc;
16+
|
17+
18+
error[E0425]: cannot find value `ptr2` in this scope
19+
--> $DIR/diagnostics-parenthesized-type-arguments-ice-issue-122345.rs:5:17
20+
|
21+
LL | dealloc(ptr2, Layout::(x: !)(1, 1));
22+
| ^^^^ not found in this scope
23+
24+
error[E0658]: the `!` type is experimental
25+
--> $DIR/diagnostics-parenthesized-type-arguments-ice-issue-122345.rs:5:35
26+
|
27+
LL | dealloc(ptr2, Layout::(x: !)(1, 1));
28+
| ^
29+
|
30+
= note: see issue #35121 <https://github.com/rust-lang/rust/issues/35121> for more information
31+
= help: add `#![feature(never_type)]` to the crate attributes to enable
32+
= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
33+
34+
error[E0425]: cannot find function, tuple struct or tuple variant `Layout` in this scope
35+
--> $DIR/diagnostics-parenthesized-type-arguments-ice-issue-122345.rs:5:23
36+
|
37+
LL | dealloc(ptr2, Layout::(x: !)(1, 1));
38+
| ^^^^^^ not found in this scope
1439

15-
error: aborting due to 2 previous errors
40+
error: aborting due to 5 previous errors
1641

42+
Some errors have detailed explanations: E0425, E0658.
43+
For more information about an error, try `rustc --explain E0425`.

‎tests/ui/parser/issues/issue-103748-ICE-wrong-braces.rs

Lines changed: 1 addition & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -2,7 +2,4 @@
22

33
struct Apple((Apple, Option(Banana ? Citron)));
44
//~^ ERROR invalid `?` in type
5-
//~| ERROR expected one of `)` or `,`, found `Citron`
6-
//~| ERROR cannot find type `Citron` in this scope [E0412]
7-
//~| ERROR parenthesized type parameters may only be used with a `Fn` trait [E0214]
8-
//~| ERROR `Apple` has infinite size
5+
//~| ERROR unexpected token: `Citron`

‎tests/ui/parser/issues/issue-103748-ICE-wrong-braces.stderr

Lines changed: 3 additions & 36 deletions
Original file line numberDiff line numberDiff line change
@@ -10,44 +10,11 @@ LL - struct Apple((Apple, Option(Banana ? Citron)));
1010
LL + struct Apple((Apple, Option(Option<Banana > Citron)));
1111
|
1212

13-
error: expected one of `)` or `,`, found `Citron`
13+
error: unexpected token: `Citron`
1414
--> $DIR/issue-103748-ICE-wrong-braces.rs:3:38
1515
|
1616
LL | struct Apple((Apple, Option(Banana ? Citron)));
17-
| -^^^^^^ expected one of `)` or `,`
18-
| |
19-
| help: missing `,`
17+
| ^^^^^^ unexpected token after this
2018

21-
error[E0412]: cannot find type `Citron` in this scope
22-
--> $DIR/issue-103748-ICE-wrong-braces.rs:3:38
23-
|
24-
LL | struct Apple((Apple, Option(Banana ? Citron)));
25-
| ^^^^^^ not found in this scope
26-
27-
error[E0214]: parenthesized type parameters may only be used with a `Fn` trait
28-
--> $DIR/issue-103748-ICE-wrong-braces.rs:3:22
29-
|
30-
LL | struct Apple((Apple, Option(Banana ? Citron)));
31-
| ^^^^^^^^^^^^^^^^^^^^^^^ only `Fn` traits may use parentheses
32-
|
33-
help: use angle brackets instead
34-
|
35-
LL - struct Apple((Apple, Option(Banana ? Citron)));
36-
LL + struct Apple((Apple, Option<Banana ? Citron>));
37-
|
38-
39-
error[E0072]: recursive type `Apple` has infinite size
40-
--> $DIR/issue-103748-ICE-wrong-braces.rs:3:1
41-
|
42-
LL | struct Apple((Apple, Option(Banana ? Citron)));
43-
| ^^^^^^^^^^^^ ----- recursive without indirection
44-
|
45-
help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to break the cycle
46-
|
47-
LL | struct Apple((Box<Apple>, Option(Banana ? Citron)));
48-
| ++++ +
49-
50-
error: aborting due to 5 previous errors
19+
error: aborting due to 2 previous errors
5120

52-
Some errors have detailed explanations: E0072, E0214, E0412.
53-
For more information about an error, try `rustc --explain E0072`.

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