os/exec: TestLookPath fails on plan9 after CL 685755 #74892
Description
CL 685755 added a new subtest TestLookPath/path=exe/dotdot1 which always fails on Plan 9 builders in this way:
--- FAIL: TestLookPath (0.43s)
dot_test.go:42: . is `/tmp/TestLookPath3081099371/001/testdir`
--- FAIL: TestLookPath/path=exe (0.01s)
--- FAIL: TestLookPath/path=exe/dotdot1 (0.01s)
dot_test.go:210: PATH=
dot_test.go:210: "abc/..": error expected, got nil
dot_test.go:210: "abc/..": path returned should be "". Got "/home/swarming/swarming2/.swarming/w/ir/x/t/go-build579210599/b1944/exec.test"
FAIL
FAIL os/exec 11.258s
Since the CL is described as a security-related fix, it's disappointing to see that it was merged without checking that it worked correctly on all platforms (not just first-class ports).