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When encountering a typo in a pattern that gets interpreted as an unused binding, look for unit struct/variant of the same type as the binding:
```
error: unused variable: `Non`
--> $DIR/binding-typo-2.rs:36:9
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LL | Non => {}
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help: if this is intentional, prefix it with an underscore
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LL | _Non => {}
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help: you might have meant to pattern match on the similarly named variant `None`
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LL - Non => {}
LL + std::prelude::v1::None => {}
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```
33 lines
884 B
Rust
33 lines
884 B
Rust
// Issue #51976
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//@ run-rustfix
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#![allow(unused_variables)] // allowed so we don't get overlapping suggestions
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enum Lol {
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Foo,
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Bar,
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}
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fn foo(x: (Lol, Lol)) {
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use Lol::*;
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match &x {
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(Foo, Bar) | (Bar, Foo) => {}
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//~^ ERROR: variable `Ban` is not bound in all patterns
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//~| HELP: you might have meant to use the similarly named previously used binding `Bar`
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//~| NOTE: pattern doesn't bind `Ban`
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//~| NOTE: variable not in all patterns
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_ => {}
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}
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match &x {
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(Foo, _) | (Bar, Foo) => {}
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//~^ ERROR: variable `Ban` is not bound in all patterns
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//~| HELP: you might have meant to use the similarly named unit variant `Bar`
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//~| NOTE: pattern doesn't bind `Ban`
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//~| NOTE: variable not in all patterns
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_ => {}
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}
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}
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fn main() {
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use Lol::*;
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foo((Foo, Bar));
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}
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