diff --git a/go/types/package.go b/go/types/package.go
index 7090c17e..f09acc7f 100644
--- a/go/types/package.go
+++ b/go/types/package.go
@@ -50,5 +50,5 @@ func (pkg *Package) Imports() []*Package { return pkg.imports }
 func (pkg *Package) SetImports(list []*Package) { pkg.imports = list }
 
 func (pkg *Package) String() string {
-	return fmt.Sprintf("package %s (%s)", pkg.name, pkg.path)
+	return fmt.Sprintf("package %s (%q)", pkg.name, pkg.path)
 }
diff --git a/go/types/resolver.go b/go/types/resolver.go
index 18c9047f..3beea8a5 100644
--- a/go/types/resolver.go
+++ b/go/types/resolver.go
@@ -388,6 +388,7 @@ func (check *checker) resolveFiles(files []*ast.File) {
 			check.objDecl(obj, nil, false)
 		}
 	}
+	check.objMap = nil // not needed anymore
 
 	// At this point we may have a non-empty check.methods map; this means that not all
 	// entries were deleted at the end of typeDecl because the respective receiver base