diff --git a/compiler/sigmatch.nim b/compiler/sigmatch.nim
index cd6e1ff9ae..40836a94d1 100644
--- a/compiler/sigmatch.nim
+++ b/compiler/sigmatch.nim
@@ -1300,6 +1300,8 @@ proc paramTypesMatchAux(m: var TCandidate, f, argType: PType,
   of isInferred, isInferredConvertible:
     if arg.kind in {nkProcDef, nkIteratorDef} + nkLambdaKinds:
       result = c.semInferredLambda(c, m.bindings, arg)
+    elif arg.kind != nkSym:
+      return nil
     else:
       let inferred = c.semGenerateInstance(c, arg.sym, m.bindings, arg.info)
       result = newSymNode(inferred, arg.info)
diff --git a/contributing.rst b/doc/contributing.rst
similarity index 100%
rename from contributing.rst
rename to doc/contributing.rst