From @masak

Both

$ ./perl6 -e '1'

and

$ ../../parrot perl6.pbc -e '1'

give the error output

Lexical '$expr' not found
current instr.​: 'parrot;Perl6;Grammar;Actions;statement' pc 137242
(src/gen_actions.pir​:14471)
called from Sub 'parrot;Perl6​::Grammar;statement' pc 25174
(src/gen_grammar.pir​:3568)
called from Sub 'parrot;Perl6​::Grammar;statementlist' pc 21882
(src/gen_grammar.pir​:2414)
called from Sub 'parrot;Perl6​::Grammar;statement_block' pc 19849
(src/gen_grammar.pir​:1650)
called from Sub 'parrot;Perl6​::Grammar;TOP' pc 16121 (src/gen_grammar.pir​:224)
called from Sub 'parrot;PCT​::HLLCompiler;parse' pc 585
(src/PCT/HLLCompiler.pir​:371)
called from Sub 'parrot;PCT​::HLLCompiler;compile' pc 438
(src/PCT/HLLCompiler.pir​:303)
called from Sub 'parrot;PCT​::HLLCompiler;eval' pc 776
(src/PCT/HLLCompiler.pir​:473)
called from Sub 'parrot;PCT​::HLLCompiler;command_line' pc 1305
(src/PCT/HLLCompiler.pir​:708)
called from Sub 'parrot;Perl6​::Compiler;main' pc 14310 (perl6.pir​:172)

From @masak

The error first appears in -r29263, the revision that introduces enums.pir.

$ svn log -r29263 -v

r29263 | jonathan | 2008-07-11 00​:50​:39 +0200 (Fri, 11 Jul 2008) | 1 line
Changed paths​:
  M /trunk/MANIFEST
  M /trunk/languages/perl6/config/makefiles/root.in
  A /trunk/languages/perl6/src/builtins/enums.pir
  M /trunk/languages/perl6/src/classes/Bool.pir

[rakudo] Switch True and False over to being real values from the (now
existing) bool enumeration, rather than instances of the Bool class.

From @masak

Um, you can close this bug. Turns out I had a dirty working copy after
finding a patch for #​56638.

Sorry for crying wolf this time.

@moritz - Status changed from 'new' to 'resolved'