tweak postfix where infix expected msg

Author: TimToady

STD.pm6

@@ -3183,8 +3183,8 @@ grammar P6 is STD {
             | <infix=infix_circumfix_meta_operator> { $<O> = $<infix><O>; $<sym> = $<infix><sym>; }
             | <infix=infix_prefix_meta_operator>    { $<O> = $<infix><O>; $<sym> = $<infix><sym>; }
             | <infix>                               { $<O> = $<infix><O>; $<sym> = $<infix><sym>; }
-            | {} <?dotty> <.panic: "Method call found where infix expected (omit whitespace?)">
-            | {} <?postfix> <.panic: "Postfix found where infix expected (omit whitespace?)">
+            | {} <?dotty> <.panic: "Method call found where infix expected (change whitespace?)">
+            | {} <?postfix> <.panic: "Postfix found where infix expected (change whitespace?)">
             ]
             [ <?before '='> <?{ $infix = $<infix>; }> <infix_postfix_meta_operator($infix)>
                    { $<O> = $<infix_postfix_meta_operator>[0]<O>; $<sym> = $<infix_postfix_meta_operator>[0]<sym>; }