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d216ca0506
During `let` binding parse error and encountering a block, detect if there is a likely missing `if` or `else`:
```
error: expected one of `.`, `;`, `?`, `else`, or an operator, found `{`
--> $DIR/missing-if-let-or-let-else.rs:14:25
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LL | let Some(x) = foo() {
| ^ expected one of `.`, `;`, `?`, `else`, or an operator
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help: you might have meant to use `if let`
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LL | if let Some(x) = foo() {
| ++
help: alternatively, you might have meant to use `let else`
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LL | let Some(x) = foo() else {
| ++++
```
25 lines
644 B
Rust
25 lines
644 B
Rust
fn a() {
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let Some(x) = foo() { //~ ERROR expected one of
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//~^ HELP you might have meant to use `if let`
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let y = x;
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}
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}
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fn b() {
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let Some(x) = foo() { //~ ERROR expected one of
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//~^ HELP you might have meant to use `let else`
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return;
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}
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}
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fn c() {
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let Some(x) = foo() { //~ ERROR expected one of
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//~^ HELP you might have meant to use `if let`
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//~| HELP alternatively, you might have meant to use `let else`
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// The parser check happens pre-macro-expansion, so we don't know for sure.
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println!("{x}");
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}
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}
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fn foo() -> Option<i32> {
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Some(42)
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}
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fn main() {}
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