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Detect missing => after match guard during parsing

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```
error: expected one of `,`, `:`, or `}`, found `.`
  --> $DIR/missing-fat-arrow.rs:25:14
   |
LL |         Some(a) if a.value == b {
   |                               - while parsing this struct
LL |             a.value = 1;
   |             -^ expected one of `,`, `:`, or `}`
   |             |
   |             while parsing this struct field
   |
help: try naming a field
   |
LL |             a: a.value = 1;
   |             ++
help: you might have meant to start a match arm after the match guard
   |
LL |         Some(a) if a.value == b => {
   |                                 ++
```

Fix #78585.
This commit is contained in:
Esteban Küber 2023-10-03 21:21:02 +00:00
parent a6dfd89fa7
commit 745c1ea438
13 changed files with 229 additions and 41 deletions
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4
compiler/rustc_parse/messages.ftl
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@ -195,6 +195,10 @@ parse_expected_else_block = expected `{"{"}`, found {$first_tok}
.label = expected an `if` or a block after this `else`
.suggestion = add an `if` if this is the condition of a chained `else if` statement
parse_expected_struct_field = expected one of `,`, `:`, or `{"}"}`, found `{$token}`
.label = expected one of `,`, `:`, or `{"}"}`
.ident_label = while parsing this struct field
parse_expected_expression_found_let = expected expression, found `let` statement
.note = only supported directly in conditions of `if` and `while` expressions
.not_supported_or = `||` operators are not supported in let chain expressions