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 // EMIT_MIR separate_const_switch.too_complex.ConstProp.diff
   8 // EMIT_MIR separate_const_switch.too_complex.PreCodegen.after.mir
   9 fn too_complex(x: Result<i32, usize>) -> Option<i32> {
  10     // The pass should break the outer match into
  11     // two blocks that only have one parent each.
  12     // Parents are one of the two branches of the first
  13     // match, so a later pass can propagate constants.
  14     match {
  15         match x {
  16             Ok(v) => ControlFlow::Continue(v),
  17             Err(r) => ControlFlow::Break(r),
  18         }
  19     } {
  20         ControlFlow::Continue(v) => Some(v),
  21         ControlFlow::Break(r) => None,
  22     }
  23 }
  24
  25 // EMIT_MIR separate_const_switch.identity.SeparateConstSwitch.diff
  26 // EMIT_MIR separate_const_switch.identity.ConstProp.diff
  27 // EMIT_MIR separate_const_switch.identity.PreCodegen.after.mir
  28 fn identity(x: Result<i32, i32>) -> Result<i32, i32> {
  29     Ok(x?)
  30 }
  31
  32 fn main() {
  33     too_complex(Ok(0));
  34     identity(Ok(0));
  35 }