wcc/ww: size/align intercept unconditionally; unknown type is loud

The size()/align() intercept hid behind a shadow gate with no cstage
twin — a shadowed name silently folded to zero. Intercept
unconditionally and make an unresolvable type a loud error, mirroring
cstage check.c:93/1538; the dead shadow gate is dropped.

selfhost/cmd/w6c/main.combined.ww

@@ -13424,14 +13424,29 @@ fn exprtype(c: *checker, e: *node, hint: *node) *node = {
 			let isalign: bool = streq(bname, "align");
 			let isoffset: bool = streq(bname, "offset");
 			if (issize || isalign || isoffset) {
-				let shadowed: bool = false;
+				// #38/F2 (review item 7): UNCONDITIONAL intercept — cstage
-				if (c.curmod.len > 0) {
+				// gates size/align/offset on NOTHING (cmd/wcc/check.c:1538-
-					if (scopelookupinmodule(c.cur, c.curmod, bname) != nil) {
+				// 1578), unlike user-shadowable alloc/abort/assert
-						shadowed = true;
+				// (check.c:1625/1740/1755). The removed same-module shadow
+				// gate had no cstage twin (its "Mirrors check.c:907-960"
+				// cite was stale — that range is N_TFN/N_TSTRUCT layout) and
+				// was already dead for primary-file decls (declmod "" →
+				// curmod.len==0 skipped it).
+				if (e.list != nil) {
+					// size/align resolve the arg as a TYPE; an unresolvable
+					// name (`size(localvar)`) is LOUD here, mirroring cstage
+					// resolve_type "unknown type '%s'" (check.c:93) — astsize
+					// otherwise folded the unresolved N_TNAME to 0 silently
+					// (rc=0 wrong binary). offset's arg is a value N_DOT and
+					// keeps its own "no field" diagnostic below.
+					if ((issize || isalign) && e.list.kind == nkind.N_TNAME
+					    && tinfofornode(c, e.list) == nil) {
+						cerr(e.list.file);
+						cerr(": error: unknown type '");
+						cerr(e.list.str);
+						cerr("'\n");
+						c.errs += 1;
 					};
-				};
-				if (!shadowed) {
-					if (e.list != nil) {
 						// Post-fold the node IS an N_INTLIT-shaped
 						// untyped_int constant. Mirrors cstage
 						// cmd/wcc/check.c:926/958 which stamps
@@ -13478,7 +13493,6 @@ fn exprtype(c: *checker, e: *node, hint: *node) *node = {
 								return mktname(c, "i32");
 							};
 						};
-					};
 				};
 			};
 		};

selfhost/cmd/wcc/check.ww

@@ -3004,14 +3004,29 @@ fn exprtype(c: *checker, e: *node, hint: *node) *node = {
 			let isalign: bool = streq(bname, "align");
 			let isoffset: bool = streq(bname, "offset");
 			if (issize || isalign || isoffset) {
-				let shadowed: bool = false;
+				// #38/F2 (review item 7): UNCONDITIONAL intercept — cstage
-				if (c.curmod.len > 0) {
+				// gates size/align/offset on NOTHING (cmd/wcc/check.c:1538-
-					if (scopelookupinmodule(c.cur, c.curmod, bname) != nil) {
+				// 1578), unlike user-shadowable alloc/abort/assert
-						shadowed = true;
+				// (check.c:1625/1740/1755). The removed same-module shadow
+				// gate had no cstage twin (its "Mirrors check.c:907-960"
+				// cite was stale — that range is N_TFN/N_TSTRUCT layout) and
+				// was already dead for primary-file decls (declmod "" →
+				// curmod.len==0 skipped it).
+				if (e.list != nil) {
+					// size/align resolve the arg as a TYPE; an unresolvable
+					// name (`size(localvar)`) is LOUD here, mirroring cstage
+					// resolve_type "unknown type '%s'" (check.c:93) — astsize
+					// otherwise folded the unresolved N_TNAME to 0 silently
+					// (rc=0 wrong binary). offset's arg is a value N_DOT and
+					// keeps its own "no field" diagnostic below.
+					if ((issize || isalign) && e.list.kind == nkind.N_TNAME
+					    && tinfofornode(c, e.list) == nil) {
+						cerr(e.list.file);
+						cerr(": error: unknown type '");
+						cerr(e.list.str);
+						cerr("'\n");
+						c.errs += 1;
 					};
-				};
-				if (!shadowed) {
-					if (e.list != nil) {
 						// Post-fold the node IS an N_INTLIT-shaped
 						// untyped_int constant. Mirrors cstage
 						// cmd/wcc/check.c:926/958 which stamps
@@ -3058,7 +3073,6 @@ fn exprtype(c: *checker, e: *node, hint: *node) *node = {
 								return mktname(c, "i32");
 							};
 						};
-					};
 				};
 			};
 		};

selfhost/cmd/wwdump/main.combined.ww

@@ -13424,14 +13424,29 @@ fn exprtype(c: *checker, e: *node, hint: *node) *node = {
 			let isalign: bool = streq(bname, "align");
 			let isoffset: bool = streq(bname, "offset");
 			if (issize || isalign || isoffset) {
-				let shadowed: bool = false;
+				// #38/F2 (review item 7): UNCONDITIONAL intercept — cstage
-				if (c.curmod.len > 0) {
+				// gates size/align/offset on NOTHING (cmd/wcc/check.c:1538-
-					if (scopelookupinmodule(c.cur, c.curmod, bname) != nil) {
+				// 1578), unlike user-shadowable alloc/abort/assert
-						shadowed = true;
+				// (check.c:1625/1740/1755). The removed same-module shadow
+				// gate had no cstage twin (its "Mirrors check.c:907-960"
+				// cite was stale — that range is N_TFN/N_TSTRUCT layout) and
+				// was already dead for primary-file decls (declmod "" →
+				// curmod.len==0 skipped it).
+				if (e.list != nil) {
+					// size/align resolve the arg as a TYPE; an unresolvable
+					// name (`size(localvar)`) is LOUD here, mirroring cstage
+					// resolve_type "unknown type '%s'" (check.c:93) — astsize
+					// otherwise folded the unresolved N_TNAME to 0 silently
+					// (rc=0 wrong binary). offset's arg is a value N_DOT and
+					// keeps its own "no field" diagnostic below.
+					if ((issize || isalign) && e.list.kind == nkind.N_TNAME
+					    && tinfofornode(c, e.list) == nil) {
+						cerr(e.list.file);
+						cerr(": error: unknown type '");
+						cerr(e.list.str);
+						cerr("'\n");
+						c.errs += 1;
 					};
-				};
-				if (!shadowed) {
-					if (e.list != nil) {
 						// Post-fold the node IS an N_INTLIT-shaped
 						// untyped_int constant. Mirrors cstage
 						// cmd/wcc/check.c:926/958 which stamps
@@ -13478,7 +13493,6 @@ fn exprtype(c: *checker, e: *node, hint: *node) *node = {
 								return mktname(c, "i32");
 							};
 						};
-					};
 				};
 			};
 		};