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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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Recover from missing param list in function definitions
Addresses the other issue mentioned in #108109
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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;
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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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```
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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Add check_unused_messages in tidy
From https://github.com/rust-lang/rust/pull/115728#issuecomment-1715490553
The check is not 100% accurate, I guess it's enough for now.
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- Add doc comment to new type
- Restore "only supported directly in conditions of `if` and `while` expressions" note
- Rename variant with clearer name
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There was an incomplete version of the check in parsing and a second
version in AST validation. This meant that some, but not all, invalid
uses were allowed inside macros/disabled cfgs. It also means that later
passes have a hard time knowing when the let expression is in a valid
location, sometimes causing ICEs.
- Add a field to ExprKind::Let in AST/HIR to mark whether it's in a
valid location.
- Suppress later errors and MIR construction for invalid let
expressions.
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Specify macro is invalid in certain contexts
Adds a note when a macro is used where it really shouldn't be.
Closes #113766
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Suggests turbofish in patterns
Fixes #114112
r? ```@estebank```
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Gracefully handle ternary operator
Fixes #112578
~~May not be the best way to do this as it doesn't check for a single `:`, so it could perhaps appear even when the actual issue is just a missing semicolon. May not be the biggest deal, though?~~
Nevermind, got it working properly now ^^
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Suggest let for possible binding with ty
Origin from https://github.com/rust-lang/rust/pull/109128#discussion_r1179866137
r? `@Nilstrieb`
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My type ascription
Oh rip it out
Ah
If you think we live too much then
You can sacrifice diagnostics
Don't mix your garbage
Into my syntax
So many weird hacks keep diagnostics alive
Yet I don't even step outside
So many bad diagnostics keep tyasc alive
Yet tyasc doesn't even bother to survive!
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This makes it easier to open the messages file while developing on features.
The commit was the result of automatted changes:
for p in compiler/rustc_*; do mv $p/locales/en-US.ftl $p/messages.ftl; rmdir $p/locales; done
for p in compiler/rustc_*; do sed -i "s#\.\./locales/en-US.ftl#../messages.ftl#" $p/src/lib.rs; done
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