net/url: TestParseErrors failing on all builders

[ALTree]

TestParseErrors is currently failing on all builders: https://build.golang.org

--- FAIL: TestParseErrors (0.00s)
    url_test.go:1459: Parse("mysql://x@y(z:123)/foo") = parse mysql://x@y(z:123)/foo: invalid port ":123)" after host; want no error
    url_test.go:1459: Parse("mysql://x@y(1.2.3.4:123)/foo") = parse mysql://x@y(1.2.3.4:123)/foo: invalid port ":123)" after host; want no error
FAIL
FAIL	net/url	0.007s
FAIL

Failures started by https://go-review.googlesource.com/c/go/+/185080

[ALTree]

Reverted : )

[av86743]

Why bots did not fail back in August?

[av86743]

Root cause: Process flaw.

Commit CL#185080 was not verified immediately before being merged. While at the time of merge, test expectations have changed as a result of other commits, making this commit to fail.