selfhost/cmd/wcc/cgenutil: exprprimresolved N_DOT off dotfieldtnode (#59)

exprprimresolved's N_DOT arm derived a struct field's prim width+sign by
walking the field's declared *node (dotfieldtnode + typenodeprimresolved
alias recursion). Read the checker-stamped tinfo instead, mirroring cstage
castsrcprim N_DOT (cmd/w6c/cgen.c:323-344): the base's n.lhs.type_ must
resolve to a struct (peel NAMED->PTR->NAMED, require TY_STRUCT) before the
field counts -- excluding pseudo-fields .len/.cap/.ptr (stamped i32/*T at
check.ww:1987-2004; their base is TY_SLICE/TY_STR/TY_ARRAY, never TY_STRUCT,
so the guard yields sz=0) and tuple positionals, which stay sz=0 to preserve
995 byte-id. The field's width/sign comes from the N_DOT's own n.type_
(check.ww:2012), one NAMED peel then typeisint?size:0. Bool exclusion is
now free via typeisint(bool)=false, dropping the old streq("bool") arm.

Polarity DOWN per rule 10: cstage castsrcprim already reads the stamped
type. typenamed() has zero callers in wwstage (tinfofornode collapses all
alias depth to the body), so no tinfo carries kind TY_NAMED -- the NAMED
peels are dead/inert, output matches cstage.

Removes one dotfieldtnode caller (3->2; remaining cgenutil 1073, 1871).
typenodeprimresolved retained (3 callers: cgenutil 1459/1465, cgenexpr 431).
Part of the dotfield* consumer-migration arc.

make test 133/133 (quiescent tree, byte-id 990-997 green). Coverage:
710_cast_enum_movl rows struct_field_rt + pseudo_field_clamp + bool_to_i8.

selfhost/cmd/w6c/main.combined.ww

@@ -11911,8 +11911,30 @@ export fn exprprimresolved(c: *cgen, n: *node,
 		return;
 	};
 	if (k == nkind.N_DOT)  {
-		typenodeprimresolved(c, dotfieldtnode(c, n),
-		    sz_out, unsigned_out);
+		// #59: read the checker-stamped tinfo instead of re-deriving the
+		// field type via dotfieldtnode's structinfo walk. Mirrors cstage
+		// castsrcprim N_DOT (cmd/w6c/cgen.c:323-344): the base must
+		// resolve to a struct (or ptr-to-struct) before the field type
+		// counts. That guard excludes pseudo-fields .len/.cap/.ptr (the
+		// checker stamps them i32/*T at check.ww:1987-2004) and tuple
+		// positionals, keeping them at sz=0 — asymmetry there breaks 995
+		// byte-id (cgen.c:286-290). The field's own width/sign is the
+		// N_DOT's stamped type_ (check.ww:2012). One TY_NAMED peel, then
+		// typeisint ? size : 0; bool falls out because typeisint(bool) is
+		// false — the same exclusion the old streq("bool") arm encoded.
+		let bu: *tinfo = nil;
+		if (n.lhs != nil) { bu = n.lhs.type_: *tinfo; };
+		if (bu != nil && bu.kind == tykind.TY_NAMED) { bu = bu.under; };
+		if (bu != nil && bu.kind == tykind.TY_PTR)   { bu = bu.sub;   };
+		if (bu != nil && bu.kind == tykind.TY_NAMED) { bu = bu.under; };
+		if (bu != nil && bu.kind == tykind.TY_STRUCT) {
+			let u: *tinfo = n.type_: *tinfo;
+			if (u != nil && u.kind == tykind.TY_NAMED) { u = u.under; };
+			if (typeisint(u)) {
+				*sz_out = u.size: i32;
+				*unsigned_out = typeisunsigned(u);
+			};
+		};
 		return;
 	};
 };

selfhost/cmd/wcc/cgenutil.ww

@@ -1470,8 +1470,30 @@ export fn exprprimresolved(c: *cgen, n: *node,
 		return;
 	};
 	if (k == nkind.N_DOT)  {
-		typenodeprimresolved(c, dotfieldtnode(c, n),
-		    sz_out, unsigned_out);
+		// #59: read the checker-stamped tinfo instead of re-deriving the
+		// field type via dotfieldtnode's structinfo walk. Mirrors cstage
+		// castsrcprim N_DOT (cmd/w6c/cgen.c:323-344): the base must
+		// resolve to a struct (or ptr-to-struct) before the field type
+		// counts. That guard excludes pseudo-fields .len/.cap/.ptr (the
+		// checker stamps them i32/*T at check.ww:1987-2004) and tuple
+		// positionals, keeping them at sz=0 — asymmetry there breaks 995
+		// byte-id (cgen.c:286-290). The field's own width/sign is the
+		// N_DOT's stamped type_ (check.ww:2012). One TY_NAMED peel, then
+		// typeisint ? size : 0; bool falls out because typeisint(bool) is
+		// false — the same exclusion the old streq("bool") arm encoded.
+		let bu: *tinfo = nil;
+		if (n.lhs != nil) { bu = n.lhs.type_: *tinfo; };
+		if (bu != nil && bu.kind == tykind.TY_NAMED) { bu = bu.under; };
+		if (bu != nil && bu.kind == tykind.TY_PTR)   { bu = bu.sub;   };
+		if (bu != nil && bu.kind == tykind.TY_NAMED) { bu = bu.under; };
+		if (bu != nil && bu.kind == tykind.TY_STRUCT) {
+			let u: *tinfo = n.type_: *tinfo;
+			if (u != nil && u.kind == tykind.TY_NAMED) { u = u.under; };
+			if (typeisint(u)) {
+				*sz_out = u.size: i32;
+				*unsigned_out = typeisunsigned(u);
+			};
+		};
 		return;
 	};
 };

selfhost/cmd/wwdump/main.combined.ww

@@ -11911,8 +11911,30 @@ export fn exprprimresolved(c: *cgen, n: *node,
 		return;
 	};
 	if (k == nkind.N_DOT)  {
-		typenodeprimresolved(c, dotfieldtnode(c, n),
-		    sz_out, unsigned_out);
+		// #59: read the checker-stamped tinfo instead of re-deriving the
+		// field type via dotfieldtnode's structinfo walk. Mirrors cstage
+		// castsrcprim N_DOT (cmd/w6c/cgen.c:323-344): the base must
+		// resolve to a struct (or ptr-to-struct) before the field type
+		// counts. That guard excludes pseudo-fields .len/.cap/.ptr (the
+		// checker stamps them i32/*T at check.ww:1987-2004) and tuple
+		// positionals, keeping them at sz=0 — asymmetry there breaks 995
+		// byte-id (cgen.c:286-290). The field's own width/sign is the
+		// N_DOT's stamped type_ (check.ww:2012). One TY_NAMED peel, then
+		// typeisint ? size : 0; bool falls out because typeisint(bool) is
+		// false — the same exclusion the old streq("bool") arm encoded.
+		let bu: *tinfo = nil;
+		if (n.lhs != nil) { bu = n.lhs.type_: *tinfo; };
+		if (bu != nil && bu.kind == tykind.TY_NAMED) { bu = bu.under; };
+		if (bu != nil && bu.kind == tykind.TY_PTR)   { bu = bu.sub;   };
+		if (bu != nil && bu.kind == tykind.TY_NAMED) { bu = bu.under; };
+		if (bu != nil && bu.kind == tykind.TY_STRUCT) {
+			let u: *tinfo = n.type_: *tinfo;
+			if (u != nil && u.kind == tykind.TY_NAMED) { u = u.under; };
+			if (typeisint(u)) {
+				*sz_out = u.size: i32;
+				*unsigned_out = typeisunsigned(u);
+			};
+		};
 		return;
 	};
 };