fixes #798

tests/trmacros/tmatrix.nim

@@ -0,0 +1,29 @@
+discard """
+  output: "21"
+"""
+
+import macros
+
+type
+  TMat = object
+    dummy: int
+
+proc `*`(a, b: TMat): TMat = nil
+proc `+`(a, b: TMat): TMat = nil
+proc `-`(a, b: TMat): TMat = nil
+proc `$`(a: TMat): string = result = $a.dummy
+proc mat21(): TMat =
+  result.dummy = 21
+
+macro optOps{ (`+`|`-`|`*`) ** a }(a: TMat): expr =
+  echo treeRepr(a)
+  result = newCall(bindSym"mat21")
+
+#macro optPlus{ `+` * a }(a: varargs[TMat]): expr =
+#  result = newIntLitNode(21)
+
+var x, y, z: TMat
+
+echo x + y * z - x 
+
+#echo x + y + z