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diff --git a/gcc/d/dmd/permissivevisitor.d b/gcc/d/dmd/permissivevisitor.d
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+++ b/gcc/d/dmd/permissivevisitor.d
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+/**
+ * A visitor that facilitates the traversal of subsets of the AST.
+ *
+ * Documentation:  https://dlang.org/phobos/dmd_permissivevisitor.html
+ * Coverage:    https://codecov.io/gh/dlang/dmd/src/master/src/dmd/permissivevisitor.d
+ */
+
+module dmd.permissivevisitor;
+
+import dmd.parsetimevisitor;
+
+/** PermissiveVisitor overrides all the visit methods in  the parent class
+  * that assert(0) in order to facilitate the traversal of subsets of the AST.
+  * It does not implement any visiting logic.
+  */
+extern(C++) class PermissiveVisitor(AST): ParseTimeVisitor!AST
+{
+    alias visit = ParseTimeVisitor!AST.visit;
+
+    override void visit(AST.Dsymbol){}
+    override void visit(AST.Parameter){}
+    override void visit(AST.Statement){}
+    override void visit(AST.Type){}
+    override void visit(AST.Expression){}
+    override void visit(AST.TemplateParameter){}
+    override void visit(AST.Condition){}
+    override void visit(AST.Initializer){}
+}