84 lines
1.5 KiB
Rust
84 lines
1.5 KiB
Rust
#![feature(exhaustive_patterns, never_type)]
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#![allow(clippy::let_and_return)]
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enum SingleVariantEnum {
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Variant(i32),
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}
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struct TupleStruct(i32);
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enum EmptyEnum {}
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fn infallible_destructuring_match_enum() {
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let wrapper = SingleVariantEnum::Variant(0);
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// This should lint!
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let data = match wrapper {
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SingleVariantEnum::Variant(i) => i,
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};
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// This shouldn't!
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let data = match wrapper {
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SingleVariantEnum::Variant(_) => -1,
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};
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// Neither should this!
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let data = match wrapper {
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SingleVariantEnum::Variant(i) => -1,
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};
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let SingleVariantEnum::Variant(data) = wrapper;
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}
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fn infallible_destructuring_match_struct() {
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let wrapper = TupleStruct(0);
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// This should lint!
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let data = match wrapper {
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TupleStruct(i) => i,
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};
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// This shouldn't!
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let data = match wrapper {
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TupleStruct(_) => -1,
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};
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// Neither should this!
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let data = match wrapper {
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TupleStruct(i) => -1,
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};
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let TupleStruct(data) = wrapper;
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}
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fn never_enum() {
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let wrapper: Result<i32, !> = Ok(23);
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// This should lint!
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let data = match wrapper {
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Ok(i) => i,
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};
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// This shouldn't!
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let data = match wrapper {
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Ok(_) => -1,
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};
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// Neither should this!
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let data = match wrapper {
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Ok(i) => -1,
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};
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let Ok(data) = wrapper;
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}
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impl EmptyEnum {
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fn match_on(&self) -> ! {
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// The lint shouldn't pick this up, as `let` won't work here!
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let data = match *self {};
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data
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}
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}
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fn main() {}
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