Hojun-Cho ef93b1637e wcc_ww/cgen: collapse cgenexpr.ww's plain TY_NAMED chase loops into tichase — byte-id neutral ...

Mechanical sweep, F2a batch 1 commit 2 (alias arc #5, rob F2 ruling:
one chased accessor is the only spelled way to dealias; this
enumeration seeds the future peellint whitelist). Every loop matching
the exact plain shape

    for (X != nil && X.kind == tykind.TY_NAMED) { X = X.under; };

(modulo variable name and one-line vs three-line layout, body exactly
the peel, guard exactly nil+NAMED) becomes `X = tichase(X);`. Census of
cgenexpr.ww at commit 1: 71 `.under` lines — 49 one-line peels + 21
multi-line-spelled peels, all eyes-classified as the plain shape, all
70 converted (count-asserted).

Survivor enumeration (raw `.under` occurrences left in cgenexpr.ww):
- cgenexpr.ww:2886 — comment text only ("follows the resolved
  NAMED.under pointer"), no code read. Classification: not a read.
Zero code-level raw `.under` reads remain in this file.

Byte-id evidence: pre-sweep w6c_ww (commit-1 build) vs post-sweep
w6c_ww compared over a 31-input corpus — all selfhost/cmd/*/
main.combined.ww (the compiler's own full source) plus the #60/#79
probe set — identical exit codes and byte-identical .s for every
input. make test-unit green (287). combined.ww regens ride along
(cgenexpr.ww is an embedded source).

2026-06-05 20:14:49 +09:00

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