build system hides error name when test fails

[nektro]

Zig Version

0.14.0, 0.15.0-dev.482+2c241b263

Steps to Reproduce and Observed Behavior

const std = @import("std");

test {
    try foo(3);
}

fn foo(x: u32) !void {
    return switch (x) {
        1 => error.A,
        2 => error.B,
        3 => error.C,
        4 => error.D,
        5 => error.E,
        else => {},
    };
}

const std = @import("std");

pub fn build(b: *std.Build) void {
    const target = b.standardTargetOptions(.{});
    const optimize = b.standardOptimizeOption(.{});

    const tests = b.addTest(.{
        .root_source_file = b.path("./test.zig"),
        .target = target,
        .optimize = optimize,
    });

    const run_tests = b.addRunArtifact(tests);

    const test_step = b.step("test", "Run unit tests");
    test_step.dependOn(&run_tests.step);
}

$ zig-master build test
test
└─ run test 0/1 passed, 1 failed
error: 'test.test_0' failed: $PWD/test.zig:8:5: 0x1048a98 in foo (test)
    return switch (x) {
    ^
$PWD/test.zig:4:5: 0x1048b38 in test_0 (test)
    try foo(3);
    ^
error: while executing test 'test.test_0', the following test command failed:
/home/meghan/zig-cache/o/cf287d5d26fc1fe6bb9ac472375e2fbc/test --seed=0x9f3ac6b2 --cache-dir=/home/meghan/zig-cache --listen=- 
Build Summary: 1/3 steps succeeded; 1 failed; 0/1 tests passed; 1 failed
test transitive failure
└─ run test 0/1 passed, 1 failed
error: the following build command failed with exit code 1:
/home/meghan/zig-cache/o/a7826d30cced5fa524e6556d6f8a77dd/build /home/meghan/.local/share/zig/0.15.0-dev.482+2c241b263/zig /home/meghan/.local/share/zig/0.15.0-dev.482+2c241b263/lib $PWD /home/meghan/zig-cache /home/meghan/.cache/zig --seed 0x9f3ac6b2 -Zb314f2171d48cad5 test

Expected Behavior

$ zig-master test test.zig 
1/1 test.test_0...FAIL (C)
$PWD/test.zig:8:5: 0x1048a98 in foo (test)
    return switch (x) {
    ^
$PWD/test.zig:4:5: 0x1048b38 in test_0 (test)
    try foo(3);
    ^
0 passed; 0 skipped; 1 failed.
error: the following test command failed with exit code 1:
/home/meghan/zig-cache/o/3e4ab8e3c5a2f9cd281a60fdef8e6d07/test --seed=0xe5ed918a

in most zig code this can be easily worked around because the source location in the stack trace will include the specific line that says return error.Foo; etc but here that's also not the case