gccgo incorrectly rejects the package below. cmd/compile and go/types correctly accept it.

The Go spec says the imported package name copy is declared in a.go's file block, whereas the predeclared copy function used in b.go is declared in the universe block. It's only an error to declare the same identifier in file and package block, not file and universe block.

-- a.go --
package p

import new "bytes"

var _ new.Buffer

-- b.go --
package p

var _ = new(int)

# command-line-arguments
./b.go:3:9: error: ‘new’ defined as both imported name and global name
    3 | var _ = new(int)
      |         ^
./a.go:3:8: note: ‘new’ imported here
    3 | import new "bytes"
      |        ^

/cc @ianlancetaylor