[perl #125638] [BUG] LTA error message on illegally post-declared label in Rakudo

[Carl Mäsak]

# New Ticket Created by  "Carl Mäsak" 
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<jaffa4> m: goto b; b: ; say "hello";
<camelia> rakudo-moar 48c0ba: OUTPUT«===SORRY!=== Error while
compiling /tmp/keUfxpNWaf␤Variable '&b' is not declared␤at
/tmp/keUfxpNWaf:1␤------> goto ⏏b; b: ; say "hello";␤»
<masak> that one could use a better error message.
<masak> std: goto B; B: say "hello"
<camelia> std 28329a7: OUTPUT«===SORRY!===␤Illegally post-declared
type:␤   'B' used at line 1␤Check failed␤FAILED 00:00 135m␤»
<masak> right.
* masak submits LTA rakudobug

STD does a better job there. (It feels like it should be possible to
figure out that B is a label and not a type here; I know there's a
heuristic in place that says upperbase => probably a type, but we do
have the label in the program in this case.) Even with "type" in the
error message, STD's error message is way better than Rakudo's, since
it says "Illegally post-declared", which is the real problem.