src/test/mir-opt/match-arm-scopes.rs

   1 // ignore-wasm32-bare compiled with panic=abort by default
   2 // Test that StorageDead and Drops are generated properly for bindings in
   3 // matches:
   4 // * The MIR should only contain a single drop of `s` and `t`: at the end
   5 //   of their respective arms.
   6 // * StorageDead and StorageLive statements are correctly matched up on
   7 //   non-unwind paths.
   8 // * The visibility scopes of the match arms should be disjoint, and contain.
   9 //   all of the bindings for that scope.
  10 // * No drop flags are used.
  11
  12 // EMIT_MIR match_arm_scopes.complicated_match SimplifyCfg-initial.after ElaborateDrops.after
  13 fn complicated_match(cond: bool, items: (bool, bool, String)) -> i32 {
  14     match items {
  15         (false, a, s) | (a, false, s) if if cond { return 3 } else { a } => 1,
  16         (true, b, t) | (false, b, t) => 2,
  17     }
  18 }
  19
  20 const CASES: &[(bool, bool, bool, i32)] = &[
  21     (false, false, false, 2),
  22     (false, false, true, 1),
  23     (false, true, false, 1),
  24     (false, true, true, 2),
  25     (true, false, false, 3),
  26     (true, false, true, 3),
  27     (true, true, false, 3),
  28     (true, true, true, 2),
  29 ];
  30
  31 fn main() {
  32     for &(cond, items_1, items_2, result) in CASES {
  33         assert_eq!(complicated_match(cond, (items_1, items_2, String::new())), result,);
  34     }
  35 }