zig

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      1 const std = @import("std");
      2 const builtin = @import("builtin");
      3 const expect = std.testing.expect;
      4 
      5 test "try on error union" {
      6     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
      7 
      8     try tryOnErrorUnionImpl();
      9     comptime try tryOnErrorUnionImpl();
     10 }
     11 
     12 fn tryOnErrorUnionImpl() !void {
     13     const x = if (returnsTen()) |val| val + 1 else |err| switch (err) {
     14         error.ItBroke, error.NoMem => 1,
     15         error.CrappedOut => @as(i32, 2),
     16         else => unreachable,
     17     };
     18     try expect(x == 11);
     19 }
     20 
     21 fn returnsTen() anyerror!i32 {
     22     return 10;
     23 }
     24 
     25 test "try without vars" {
     26     const result1 = if (failIfTrue(true)) 1 else |_| @as(i32, 2);
     27     try expect(result1 == 2);
     28 
     29     const result2 = if (failIfTrue(false)) 1 else |_| @as(i32, 2);
     30     try expect(result2 == 1);
     31 }
     32 
     33 fn failIfTrue(ok: bool) anyerror!void {
     34     if (ok) {
     35         return error.ItBroke;
     36     } else {
     37         return;
     38     }
     39 }
     40 
     41 test "try then not executed with assignment" {
     42     if (failIfTrue(true)) {
     43         unreachable;
     44     } else |err| {
     45         try expect(err == error.ItBroke);
     46     }
     47 }