zig

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      1 const std = @import("std");
      2 
      3 pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace) noreturn {
      4     _ = stack_trace;
      5     if (std.mem.eql(u8, message, "invalid error code")) {
      6         std.process.exit(0);
      7     }
      8     std.process.exit(1);
      9 }
     10 const Set1 = error{A, B};
     11 const Set2 = error{A, C};
     12 pub fn main() !void {
     13     foo(Set1.B) catch {};
     14     return error.TestFailed;
     15 }
     16 fn foo(set1: Set1) Set2 {
     17     return @errSetCast(Set2, set1);
     18 }
     19 // run
     20 // backend=llvm
     21 // target=native