zig

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      1 fn returns() usize {
      2     return 2;
      3 }
      4 export fn f1() void {
      5     for ("hello") |_| returns();
      6 }
      7 export fn f2() void {
      8     var x: anyerror!i32 = error.Bad;
      9     for ("hello") |_| returns() else unreachable;
     10     _ = x;
     11 }
     12 
     13 // for loop body expression ignored
     14 //
     15 // tmp.zig:5:30: error: expression value is ignored
     16 // tmp.zig:9:30: error: expression value is ignored