30 lines
1,019 B
Rust
30 lines
1,019 B
Rust
// compile-flags: -Zunsound-mir-opts
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// EMIT_MIR simplify_try.try_identity.SimplifyArmIdentity.diff
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// EMIT_MIR simplify_try.try_identity.SimplifyBranchSame.after.mir
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// EMIT_MIR simplify_try.try_identity.SimplifyLocals.after.mir
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// EMIT_MIR simplify_try.try_identity.DestinationPropagation.diff
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fn into_result<T, E>(r: Result<T, E>) -> Result<T, E> {
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r
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}
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fn from_error<T, E>(e: E) -> Result<T, E> {
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Err(e)
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}
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// This was written to the `?` from `try_trait`, but `try_trait_v2` uses a different structure,
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// so the relevant desugar is copied inline in order to keep the test testing the same thing.
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// FIXME(#85133): while this might be useful for `r#try!`, it would be nice to have a MIR
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// optimization that picks up the `?` desugaring, as `SimplifyArmIdentity` does not.
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fn try_identity(x: Result<u32, i32>) -> Result<u32, i32> {
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let y = match into_result(x) {
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Err(e) => return from_error(From::from(e)),
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Ok(v) => v,
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};
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Ok(y)
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}
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fn main() {
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let _ = try_identity(Ok(0));
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}
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