Internal packages (packages that are inside a folder that has an internal folder in their path) can only be imported from packages rooted at the parent of the internal folder. E.g. a package pkg/foo/internal/bar can be imported by the package pkg/foo/internal/baz and also from pkg/foo/baz, but cannot be imported by the package pkg nor can … Read more
See my answer to another question. You need a blank line after the // +build line. Also, you probably want the ! in config.go, not in config.debug.go; and presumably you want one to be “DEBUG = false”.
Go 1.18 The new directive //go:build is now preferred and the toolchain will actively remove old directives; as mentioned in Go 1.18 release notes: In Go 1.18, go fix now removes the now-obsolete // +build lines in modules declaring go 1.18 or later in their go.mod files. Due to the above, if you attempt to … Read more
You must follow // +build XXX with a blank line. In my brief search, I couldn’t find where/if this is documented. But the source clearly calls it out