fixes #4435 (#9185)

(cherry picked from commit dd65986795)

compiler/sigmatch.nim

@@ -1292,7 +1292,7 @@ proc typeRelImpl(c: var TCandidate, f, aOrig: PType,
   of tyDistinct:
     if a.kind == tyDistinct:
       if sameDistinctTypes(f, a): result = isEqual
-      elif f.base.kind == tyAnything: result = isGeneric
+      #elif f.base.kind == tyAnything: result = isGeneric  # issue 4435
       elif c.coerceDistincts: result = typeRel(c, f.base, a)
     elif a.kind == tyNil and f.base.kind in NilableTypes:
       result = f.allowsNil

tests/distinct/t4435.nim

@@ -0,0 +1,21 @@
+discard """
+  output: '''
+A
+A
+'''
+"""
+
+type
+  A[T] = distinct T
+  B[T] = distinct T
+
+proc foo[T](x:A[T]) = echo "A"
+proc foo[T](x:B[T]) = echo "B"
+proc bar(x:A) = echo "A"
+proc bar(x:B) = echo "B"
+
+var
+  a:A[int]
+
+foo(a) # fine
+bar(a) # testdistinct.nim(14, 4) Error: ambiguous call; both testdistinct.bar(x: A) and testdistinct.bar(x: B) match for: (A[system.int])