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diff --git a/gcc/rust/resolve/rust-ast-resolve-pattern.h b/gcc/rust/resolve/rust-ast-resolve-pattern.h
new file mode 100644
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+++ b/gcc/rust/resolve/rust-ast-resolve-pattern.h
@@ -0,0 +1,97 @@
+// Copyright (C) 2020 Free Software Foundation, Inc.
+
+// This file is part of GCC.
+
+// GCC is free software; you can redistribute it and/or modify it under
+// the terms of the GNU General Public License as published by the Free
+// Software Foundation; either version 3, or (at your option) any later
+// version.
+
+// GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+// for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with GCC; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#ifndef RUST_AST_RESOLVE_PATTERN_H
+#define RUST_AST_RESOLVE_PATTERN_H
+
+#include "rust-ast-resolve-base.h"
+#include "rust-ast-full.h"
+
+namespace Rust {
+namespace Resolver {
+
+class ResolvePattern : public ResolverBase
+{
+public:
+  static void go (AST::Pattern *pattern, NodeId parent)
+  {
+    ResolvePattern resolver (parent);
+
+    pattern->accept_vis (resolver);
+    if (resolver.resolved_node == UNKNOWN_NODEID)
+      {
+	rust_error_at (resolver.locus, "failed to resolve pattern %s",
+		       pattern->as_string ().c_str ());
+      }
+  };
+
+  ~ResolvePattern () {}
+
+  void visit (AST::IdentifierPattern &pattern)
+  {
+    if (resolver->get_name_scope ().lookup (pattern.get_ident (),
+					    &resolved_node))
+      {
+	resolver->insert_resolved_name (pattern.get_node_id (), resolved_node);
+	resolver->insert_new_definition (pattern.get_node_id (),
+					 Definition{pattern.get_node_id (),
+						    parent});
+      }
+  }
+
+private:
+  ResolvePattern (NodeId parent) : ResolverBase (parent) {}
+};
+
+class PatternDeclaration : public ResolverBase
+{
+public:
+  static void go (AST::Pattern *pattern, NodeId parent)
+  {
+    PatternDeclaration resolver (parent);
+
+    pattern->accept_vis (resolver);
+    if (resolver.resolved_node != UNKNOWN_NODEID)
+      {
+	// print both locations?!
+	rust_error_at (resolver.locus, "duplicate pattern %s",
+		       pattern->as_string ().c_str ());
+      }
+  };
+
+  ~PatternDeclaration () {}
+
+  void visit (AST::IdentifierPattern &pattern)
+  {
+    // if we have a duplicate id this then allows for shadowing correctly
+    // as new refs to this decl will match back here so it is ok to overwrite
+    resolver->get_name_scope ().insert (pattern.get_ident (),
+					pattern.get_node_id ());
+    resolver->insert_new_definition (pattern.get_node_id (),
+				     Definition{pattern.get_node_id (),
+						parent});
+  }
+
+private:
+  PatternDeclaration (NodeId parent) : ResolverBase (parent) {}
+};
+
+} // namespace Resolver
+} // namespace Rust
+
+#endif // RUST_AST_RESOLVE_PATTERN_H