net: TestLookupDotsWithLocalSource failures

[gopherbot]

#!watchflakes
default <- pkg == "net" && test == "TestLookupDotsWithLocalSource"

Issue created automatically to collect these failures.

Example (log):

--- FAIL: TestLookupDotsWithLocalSource (0.00s)
    lookup_test.go:626: netgo: got localhost.; want localhost

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "net" && test == "TestLookupDotsWithLocalSource"

2023-12-12 19:42 windows-amd64-2016 go@c2079deb net.TestLookupDotsWithLocalSource (log)

--- FAIL: TestLookupDotsWithLocalSource (0.00s)
    lookup_test.go:626: netgo: got localhost.; want localhost

— watchflakes

[mateusz834]

The go resolver might return localhost., when the order is not hostLookupFilesDNS/hostLookupFiles or the hosts file does not have localhost defined there.

go/src/net/dnsclient_unix.go

Line 891 in f2d243d

ptrs = append(ptrs, ptr.PTR.String())