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Storing defers this way has the benefits that the defer doesn't get analyzed multiple times in AstGen, it takes up less space, and it makes Sema aware of defers allowing for 'unreachable else prong' error on error sets in generic code. The disadvantage is that it is a bit more complex and errdefers with payloads now emit a placeholder instruction (but those are rare). Sema.zig before: Total ZIR bytes: 3.7794370651245117MiB Instructions: 238996 (2.051319122314453MiB) String Table Bytes: 89.2802734375KiB Extra Data Items: 430144 (1.640869140625MiB) Sema.zig after: Total ZIR bytes: 3.3344192504882812MiB Instructions: 211829 (1.8181428909301758MiB) String Table Bytes: 89.2802734375KiB Extra Data Items: 374611 (1.4290275573730469MiB)
Test Case Quick Reference
Use comments at the end of the file to indicate metadata about the test case. Here are examples of different kinds of tests:
Compile Error Test
If you want it to be run with zig test and match expected error messages:
// error
// is_test=1
//
// :4:13: error: 'try' outside function scope
Execution
This will do zig run on the code and expect exit code 0.
// run
Incremental Compilation
Make multiple files that have ".", and then an integer, before the ".zig" extension, like this:
hello.0.zig
hello.1.zig
hello.2.zig
Each file can be a different kind of test, such as expecting compile errors, or expecting to be run and exit(0). The test harness will use these to simulate incremental compilation.
At the time of writing there is no way to specify multiple files being changed as part of an update.
Subdirectories
Subdirectories do not have any semantic meaning but they can be used for organization since the test harness will recurse into them. The full directory path will be prepended as a prefix on the test case name.
Limiting which Backends and Targets are Tested
// run
// backend=stage2,llvm
// target=x86_64-linux,x86_64-macos
Possible backends are:
stage1: equivalent to-fstage1.stage2: equivalent to passing-fno-stage1 -fno-LLVM.llvm: equivalent to-fLLVM -fno-stage1.