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Jon Ross-Perkins
cc6f21e402
When we always had a single file in the test file, we could run the
driver over it to see output. This adds the ability to do something
similar for multi-file tests. So for example in test output, there's
now:
```
[ RUN ] ToolchainFileTest.toolchain/check/testdata/class/fail_todo_import.carbon
To test this file alone, run:
bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/class/fail_todo_import.carbon
To view output, run:
bazel run //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/class/fail_todo_import.carbon --test_arg=--dump_output
[ OK ] ToolchainFileTest.toolchain/check/testdata/class/fail_todo_import.carbon (64 ms)
```
And here's what a run looks like:
```
$ bazel run //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/class/fail_todo_import.carbon --test_arg=--dump_output
(elided bazel output)
Executing tests from //toolchain/testing:file_test
-----------------------------------------------------------------------------
===============================================================================
= toolchain/check/testdata/class/fail_todo_import.carbon
===============================================================================
= stderr
===============================================================================
b.carbon: ERROR: Semantics TODO: `TryResolveImportRefUnused on ClassDecl`.
b.carbon: ERROR: Semantics TODO: `TryResolveImportRefUnused on ClassDecl`.
b.carbon: ERROR: Semantics TODO: `TryResolveInst on ClassType`.
b.carbon: ERROR: Semantics TODO: `TryResolveInst on ClassType`.
b.carbon:18:29: ERROR: Name `d_ref` not found.
var d: (ForwardDeclared,) = d_ref;
^~~~~
===============================================================================
= stdout
===============================================================================
--- a.carbon
(eliding semir output)
}
===============================================================================
= Exit with success: false
===============================================================================
Done!
```
This also switches from PrettyStackTraceFormat to
PrettyStackTraceString. This is partly so that we can share the produced
command (avoiding two different format strings corresponding to the same
value), but also it's in my mind to step away from
https://github.com/llvm/llvm-project/pull/77351.