std lib fmt test generate too many locals on wasm32 in Debug mode

[dweiller]

Zig Version

0.11.0-dev commit d71a43e

Steps to Reproduce and Observed Behavior

Comment out the second test called "enum" in lib/std/fmt.zig and then run the stdlib tests under wasmtime: zig test lib/std/std.zig -target wasm32-wasi --test-cmd wasmtime --test-cmd --dir=. --test-cmd-bin --test-cmd --.

This fails with:

Error: if you're trying to run a precompiled module, pass --allow-precompiled

Caused by:
    0: failed to compile wasm function 958 (`fmt.formatType__anon_44251`) at offset 0x117a56
    1: WebAssembly translation error
    2: Invalid input WebAssembly code at offset 1145431: too many locals: locals exceed maximum

Due to the line in the first test called "enum" containing this line:

try expectFmt("enum: os.windows.win32error.Win32Error.INVALID_FUNCTION\n", "enum: {}\n", std.os.windows.Win32Error.INVALID_FUNCTION});

In release modes the test passes. This is presumably something about lack of optimisations producing many locals due to the size of the os.windows.Win32Error enum.

Note that due to #13599 and #14583 the first test named "enum" hasn't been running for some time, so I'm not sure when this regressed (or if it even did).

Expected Behavior

The test should pass.

[squeek502]

Seems possibly related to #15353