fixes #1657

compiler/semexprs.nim

@@ -960,9 +960,13 @@ proc builtinFieldAccess(c: PContext, n: PNode, flags: TExprFlags): PNode =
 
   var s = qualifiedLookUp(c, n, {checkAmbiguity, checkUndeclared})
   if s != nil:
-    markUsed(n.sons[1].info, s)
+    if s.kind in OverloadableSyms:
+      result = symChoice(c, n, s, scClosed)
+    else:
+      markUsed(n.sons[1].info, s)
+      result = semSym(c, n, s, flags)
     styleCheckUse(n.sons[1].info, s)
-    return semSym(c, n, s, flags)
+    return
 
   n.sons[0] = semExprWithType(c, n.sons[0], flags+{efDetermineType})
   #restoreOldStyleType(n.sons[0])

tests/overload/tsystemcmp.nim

@@ -0,0 +1,9 @@
+discard """
+  cmd: r"nim c --hints:on $options --threads:on $file"
+"""
+
+import algorithm
+
+# bug #1657
+var modules = @["hi", "ho", "ha", "huu"]
+sort(modules, system.cmp)