Hojun-Cho
dc8405429e
Selfhost parser (lib/ww/parse/expr.ww) recognises postfix `?` and `!` at the same level as `as`/`is`/`:`. Selfhost cgen (selfhost/cmd/wcc/cgenexpr.ww) emits matching code: cmp AX against the success tag (0 in legacy mode), branch over the propagate / abort path, then unwrap (DX → AX, CX → BX for str). Mirrors the C cgen but without the tag-remap loop — none of the selfhost code that uses `?` today needs cross-shape remapping. lib/ww/lex/lex.ww \\x escape handling switched from 5-line match blocks to one-liners: ascii.digitval(c: rune)!. Both digits are already validated by isxdigit above; the void variant is unreachable, so `!` collapses correctly. 995 fixed-point gate verifies the selfhost cgen produces the same `!` codegen as C cgen.