38 lines
890 B
Rust
38 lines
890 B
Rust
// compile-flags: -O -C debuginfo=0 -Zmir-opt-level=2
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// only-64bit
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// Track the status of MIR optimizations simplifying `Ok(res?)` for both the old and new desugarings
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// of that syntax.
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use std::ops::ControlFlow;
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// EMIT_MIR try_identity.new.PreCodegen.after.mir
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fn new<T, E>(x: Result<T, E>) -> Result<T, E> {
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Ok(
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match {
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match x {
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Ok(v) => ControlFlow::Continue(v),
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Err(e) => ControlFlow::Break(e),
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}
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} {
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ControlFlow::Continue(v) => v,
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ControlFlow::Break(e) => return Err(e),
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}
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)
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}
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// EMIT_MIR try_identity.old.PreCodegen.after.mir
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fn old<T, E>(x: Result<T, E>) -> Result<T, E> {
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Ok(
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match x {
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Ok(v) => v,
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Err(e) => return Err(e),
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}
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)
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}
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fn main() {
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let _ = new::<(), ()>(Ok(()));
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let _ = old::<(), ()>(Ok(()));
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}
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