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T.Setenv ensures that the environment is returned to its prior state when the test ends. It also panics when called from a parallel test to prevent racy test interdependencies.
Typecheck does cross-platform typechecking of source code for all Go build
platforms.
The primary benefit is speed: a full Kubernetes cross-build takes 20 minutes
and >40GB of RAM, while this takes under 2 minutes and <8GB of RAM.
It uses Go's built-in parsing and typechecking libraries (go/parser and
go/types), which unfortunately are not what the go compiler uses. Occasional
mismatches will occur, but overall they correspond closely.
Failures can be ignored if they don't block the build:
Things go/types errors on that go build doesn't:
True errors (according to the spec):
These should be fixed whenever possible. Ignore if a fix isn't possible
or is in progress (e.g., vendored code).
- unused variables in closures
False errors:
These should be ignored and reported upstream if applicable.
- type checking mismatches between staging and generated types
Things go build fails on that we don't:
- CGo errors, including syntax and linker errors.