Debug statements near a bug I'm investigating

1-test.p6

{
    my $ast = q:to/./;
        (statements
          (sub (ident "f") (parameters) (statements
            (my (ident "b") (assign (ident "b") (block (parameters) (statements
              (return (int 5))))))
            (sub (ident "g") (parameters) (statements
              (stexpr (call (ident "b") (arguments)))))
            (stexpr (call (ident "g") (arguments)))
            (stexpr (call (ident "say") (arguments (str "Dead code. Should have returned from f."))))))
          (stexpr (call (ident "f") (arguments))))
        .

    is-result $ast, "", "return statements bind lexically to their surrounding subroutine";
}

debug-statements.txt

RUNTIME RUN
INVOKING Q::Identifier.new(name => "f")
GET-VAR f
FIND LOOKING IN Frame|197586992 (elems, charat, int, lc, trim, sorted, prefix:<->, min, join, index, grep, map, f, abs, chr, ord, uc, reversed, substr, type, max, chars, Q::Literal::Str, Q::Arguments, str, split, Q::Identifier, say, Q::Postfix::Call, infix:<+>)
THE THING WE GOT WAS A Val::Sub
DECLARE-VAR g
PUT-VAR g
FIND LOOKING IN Frame|197587088 (g)
THE THING WE PUT WAS A Val::Sub
DECLARE-VAR b
PUT-VAR b
FIND LOOKING IN Frame|197587088 (g, b)
THE THING WE PUT WAS A Val::None
DECLARE-VAR --RETURN-TO--
PUT-VAR --RETURN-TO--
FIND LOOKING IN Frame|197587088 (g, b, --RETURN-TO--)
THE THING WE PUT WAS A Frame
ASSIGNING b
  (value): Val::Block
PUT-VAR b
FIND LOOKING IN Frame|197587088 (g, b, --RETURN-TO--)
THE THING WE PUT WAS A Val::Block
GET-VAR b
FIND LOOKING IN Frame|197587088 (g, b, --RETURN-TO--)
THE THING WE GOT WAS A Val::Block <--- look, so we even see that we stored it correctly
HM: Val::Block
INVOKING Q::Identifier.new(name => "g")
GET-VAR g
FIND LOOKING IN Frame|197587088 (g, b, --RETURN-TO--)
THE THING WE GOT WAS A Val::Sub
DECLARE-VAR --RETURN-TO--
PUT-VAR --RETURN-TO--
FIND LOOKING IN Frame|197587136 (--RETURN-TO--)
THE THING WE PUT WAS A Frame
INVOKING Q::Identifier.new(name => "b")
GET-VAR b
FIND LOOKING IN Frame|197587136 (--RETURN-TO--)
FIND LOOKING IN Frame|197586944 (g, b)
THE THING WE GOT WAS A Val::None <--- and now when we look again from inside sub g, the block is gone
Trying to invoke a None
  in method eval at /home/masak/ours/007/lib/_007/Q.pm:228
  in method run at /home/masak/ours/007/lib/_007/Q.pm:275
  in method run at /home/masak/ours/007/lib/_007/Q.pm:451
  in method call at /home/masak/ours/007/lib/_007/Runtime.pm:184
  in method eval at /home/masak/ours/007/lib/_007/Q.pm:231
  in method run at /home/masak/ours/007/lib/_007/Q.pm:275
  in method run at /home/masak/ours/007/lib/_007/Q.pm:451
  in method call at /home/masak/ours/007/lib/_007/Runtime.pm:184
  in method eval at /home/masak/ours/007/lib/_007/Q.pm:231
  in method run at /home/masak/ours/007/lib/_007/Q.pm:275
  in method run at /home/masak/ours/007/lib/_007/Q.pm:451
  in method run at /home/masak/ours/007/lib/_007/Runtime.pm:31
  in sub is-result at /home/masak/ours/007/lib/_007/Test.pm:186
  in block <unit> at t/semantics/return.t:18

Ok, spotted it.

Lines 25 and 38 should be the same frame/pad, but they're different. Likely one of them is the static frame/pad.