go/src/cmd/compile/internal/typecheck/builtin.go

// Not inlining this function removes a significant chunk of init code.
//
//go:noinline
func newSig(params, results []*types.Field) *types.Type { … }

func params(tlist ...*types.Type) []*types.Field { … }

var runtimeDecls …

func runtimeTypes() []*types.Type { … }

var coverageDecls …

func coverageTypes() []*types.Type { … }