cmd/build: wrong error on misspelled GOOS #21999
Description
go version devel +39983cf491 Wed Sep 20 18:11:52 2017 +0000 linux/amd64
package has 2 files: test_linux.go
package testand test_windows.go:
package test$ GOOS=windwos go build ./test
can't load package: package test: build constraints exclude all Go files in /gopath/test
should say:
$ GOOS=windwos go build ./test
cmd/go: unsupported GOOS/GOARCH pair windwos/amd64