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// compile-flags: -Z mir-opt-level=3 -Zunsound-mir-opts
// EMIT_MIR simplify_arm.id.SimplifyArmIdentity.diff
// EMIT_MIR simplify_arm.id.SimplifyBranchSame.diff
// EMIT_MIR simplify_arm.id_result.SimplifyArmIdentity.diff
// EMIT_MIR simplify_arm.id_result.SimplifyBranchSame.diff
// EMIT_MIR simplify_arm.id_try.SimplifyArmIdentity.diff
// EMIT_MIR simplify_arm.id_try.SimplifyBranchSame.diff
fn id(o: Option<u8>) -> Option<u8> {
match o {
Some(v) => Some(v),
None => None,
}
}
fn id_result(r: Result<u8, i32>) -> Result<u8, i32> {
match r {
Ok(x) => Ok(x),
Err(y) => Err(y),
}
}
fn into_result<T, E>(r: Result<T, E>) -> Result<T, E> {
r
}
fn from_error<T, E>(e: E) -> Result<T, E> {
Err(e)
}
// This was written to the `?` from `try_trait`, but `try_trait_v2` uses a different structure,
// so the relevant desugar is copied inline in order to keep the test testing the same thing.
// FIXME(#85133): while this might be useful for `r#try!`, it would be nice to have a MIR
// optimization that picks up the `?` desugaring, as `SimplifyArmIdentity` does not.
fn id_try(r: Result<u8, i32>) -> Result<u8, i32> {
let x = match into_result(r) {
Err(e) => return from_error(From::from(e)),
Ok(v) => v,
};
Ok(x)
}
fn main() {
id(None);
id_result(Ok(4));
id_try(Ok(4));
}
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