mockgen: Sanitize the "any" package name

When a package name is "any" mockgen will use that as a package name
in the generated code which causes issues due to colliding with Go's
"any" type. Update the sanitization logic to prevent this collision.

mockgen/internal/tests/sanitization/any/any.go

@@ -0,0 +1,5 @@
+package any
+
+// Any is a type of a package that tests the sanitization of imported packages
+// named any.
+type Any struct {}

mockgen/internal/tests/sanitization/interface.go

@@ -0,0 +1,11 @@
+package sanitization
+
+import (
+	"go.uber.org/mock/mockgen/internal/tests/sanitization/any"
+)
+
+//go:generate mockgen -destination mock.go . AnyMock
+
+type AnyMock interface {
+	Do(a *any.Any, b int)
+}

mockgen/mockgen.go

@@ -378,7 +378,7 @@ func (g *generator) Generate(pkg *model.Package, outputPkgName string, outputPac
 		}
 
 		i := 0
-		for localNames[pkgName] || token.Lookup(pkgName).IsKeyword() {
+		for localNames[pkgName] || token.Lookup(pkgName).IsKeyword() || pkgName == "any" {
 			pkgName = base + strconv.Itoa(i)
 			i++
 		}