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r=petrochenkov
Validate that we're only matching on unit struct for path pattern
Resolution doesn't validate that we only really take `CtorKind::Unit` in path patterns, since all it sees is `Res::SelfCtor(def_id)`. Check this instead during pattern typeck.
r? petrochenkov
Fixes #122809
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Handle str literals written with `'` lexed as lifetime
Given `'hello world'` and `'1 str', provide a structured suggestion for a valid string literal:
```
error[E0762]: unterminated character literal
--> $DIR/lex-bad-str-literal-as-char-3.rs:2:26
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LL | println!('hello world');
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help: if you meant to write a `str` literal, use double quotes
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LL | println!("hello world");
| ~ ~
```
```
error[E0762]: unterminated character literal
--> $DIR/lex-bad-str-literal-as-char-1.rs:2:20
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LL | println!('1 + 1');
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help: if you meant to write a `str` literal, use double quotes
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LL | println!("1 + 1");
| ~ ~
```
Fix #119685.
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```
error: `S2<'_>` is forbidden as the type of a const generic parameter
--> $DIR/lifetime-in-const-param.rs:5:23
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LL | struct S<'a, const N: S2>(&'a ());
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= note: the only supported types are integers, `bool` and `char`
help: add `#![feature(adt_const_params)]` to the crate attributes to enable more complex and user defined types
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LL + #![feature(adt_const_params)]
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```
Fix #55941.
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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
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2 | let _: std::env::temp_dir().join("foo");
| - ^ expected one of `!`, `+`, `->`, `::`, `;`, or `=`
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| while parsing the type for `_`
| help: use `=` if you meant to assign
```
Fix #119665.
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make matching on NaN a hard error, and remove the rest of illegal_floating_point_literal_pattern
These arms would never be hit anyway, so the pattern makes little sense. We have had a future-compat lint against float matches in general for a *long* time, so I hope we can get away with immediately making this a hard error.
This is part of implementing https://github.com/rust-lang/rfcs/pull/3535.
Closes https://github.com/rust-lang/rust/issues/41620 by removing the lint.
https://github.com/rust-lang/reference/pull/1456 updates the reference to match.
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Update tests
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Merge `unused_tuple_struct_fields` into `dead_code`
This implicitly upgrades the lint from `allow` to `warn` and places it into the `unused` lint group.
[Discussion on Zulip](https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/Moving.20.60unused_tuple_struct_fields.60.20from.20allow.20to.20warn)
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Attribute values must be literals. The error you get when that doesn't
hold is pretty bad, e.g.:
```
unexpected expression: 1 + 1
```
You also get the same error if the attribute value is a literal, but an
invalid literal, e.g.:
```
unexpected expression: "foo"suffix
```
This commit does two things.
- Changes the error message to "attribute value must be a literal",
which gives a better idea of what the problem is and how to fix it. It
also no longer prints the invalid expression, because the carets below
highlight it anyway.
- Separates the "not a literal" case from the "invalid literal" case.
Which means invalid literals now get the specific error at the literal
level, rather than at the attribute level.
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never_patterns: Parse match arms with no body
Never patterns are meant to signal unreachable cases, and thus don't take bodies:
```rust
let ptr: *const Option<!> = ...;
match *ptr {
None => { foo(); }
Some(!),
}
```
This PR makes rustc accept the above, and enforces that an arm has a body xor is a never pattern. This affects parsing of match arms even with the feature off, so this is delicate. (Plus this is my first non-trivial change to the parser).
~~The last commit is optional; it introduces a bit of churn to allow the new suggestions to be machine-applicable. There may be a better solution? I'm not sure.~~ EDIT: I removed that commit
r? `@compiler-errors`
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Fix parser ICE from attrs
Fixes #118531,
Fixes #118530.
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Co-authored-by: Adrian <adrian.iosdev@gmail.com>
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Remove asmjs
Fulfills [MCP 668](https://github.com/rust-lang/compiler-team/issues/668).
`asmjs-unknown-emscripten` does not work as-specified, and lacks essential upstream support for generating asm.js, so it should not exist at all.
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Tweak error and move tests
r? `@Nilstrieb`
Split off #117565.
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Handle and recover `match expr { pat >= { arm } }`.
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Recover from incorrectly ordered/duplicated function keywords
Fixes #115714
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Give a better diagnostic for missing parens in Fn* bounds
Fixes #108109
It would be nice to try and recover here, but I'm not sure it's worth the effort, especially as the bounds on the recovered function would be incorrect.
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When parsing a closure without a body that is surrounded by a block,
suggest moving the opening brace after the closure head.
Fix #116608.
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Detect missing `=>` after match guard during parsing
```
error: expected one of `,`, `:`, or `}`, found `.`
--> $DIR/missing-fat-arrow.rs:25:14
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LL | Some(a) if a.value == b {
| - while parsing this struct
LL | a.value = 1;
| -^ expected one of `,`, `:`, or `}`
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| while parsing this struct field
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help: try naming a field
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LL | a: a.value = 1;
| ++
help: you might have meant to start a match arm after the match guard
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LL | Some(a) if a.value == b => {
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```
Fix #78585.
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```
error: expected one of `,`, `:`, or `}`, found `.`
--> $DIR/missing-fat-arrow.rs:25:14
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LL | Some(a) if a.value == b {
| - while parsing this struct
LL | a.value = 1;
| -^ expected one of `,`, `:`, or `}`
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| while parsing this struct field
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help: try naming a field
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LL | a: a.value = 1;
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help: you might have meant to start a match arm after the match guard
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LL | Some(a) if a.value == b => {
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```
Fix #78585.
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