w6a's parsenum diverged from the C twin's strtoll(s,end,0)
(cmd/w6a/lex.c:30) on three hand-written-asm edge shapes (all
gate-blind — w6c emits the canonical $5/$8/-8(BP), never these):
(a) `$ 5` — leading whitespace: strtoll skips it (->5); ww had no
skip and silently encoded imm 0.
(b) `$08` — strtoll base-0 reads a leading 0 as octal, stops at '8'
(->0); ww parsed it as decimal 8.
(c) `-(BP)` — strtoll/cstage require a digit after the sign, so a bare
`-(` is unrecognised operand; ww silently took it as 0(BP).
Add the whitespace skip + octal base-0 detection to parsenum, and the
digit-after-sign guard to the operand scanner — both assemblers now
agree byte-for-byte (a/b) and both reject (c).
Not a Hare item (w6a is ww's plan9-lineage assembler); reference is the
C strtoll twin. w6a embeds into its own combined.ww snapshot; regen'd.
530_w6a_parsenum pins the byte-identity + both-reject matrix.
Hojun-Cho
559b77db40