src/test/mir-opt/separate_const_switch.rs

   1 #![feature(control_flow_enum)]
   2 #![feature(try_trait_v2)]
   3
   4 use std::ops::ControlFlow;
   5
   6 // EMIT_MIR separate_const_switch.too_complex.SeparateConstSwitch.diff
   7 fn too_complex(x: Result<i32, usize>) -> Option<i32> {
   8     // The pass should break the outer match into
   9     // two blocks that only have one parent each.
  10     // Parents are one of the two branches of the first
  11     // match, so a later pass can propagate constants.
  12     match {
  13         match x {
  14             Ok(v) => ControlFlow::Continue(v),
  15             Err(r) => ControlFlow::Break(r),
  16         }
  17     } {
  18         ControlFlow::Continue(v) => Some(v),
  19         ControlFlow::Break(r) => None,
  20     }
  21 }
  22
  23 // EMIT_MIR separate_const_switch.identity.SeparateConstSwitch.diff
  24 fn identity(x: Result<i32, i32>) -> Result<i32, i32> {
  25     Ok(x?)
  26 }
  27
  28 fn main() {
  29     too_complex(Ok(0));
  30     identity(Ok(0));
  31 }