module TestOnlyImport where import Prelude(String) f::String f = "" yields: nhc98 -c -o TestOnlyImport.o TestOnlyImport.hs ====== Errors when renaming: Constructor () used at is not defined. Constructor Prelude.2 used at is not defined. Type constructor Prelude.2 used at is not defined. Constructor Prelude.: used at is not defined. Constructor Prelude.[] used at is not defined. Identifier Prelude.undefined used at is not defined. Identifier Prelude.id used at is not defined. Constructor Prelude.False used at is not defined. Constructor Prelude.True used at is not defined. Identifier Prelude.flip used at is not defined. Identifier Prelude.error used at is not defined. Type constructor Prelude.Int used at is not defined.