trial: unblock the DOS build (local only, not for merge)

fec/Makefile

@@ -1,7 +1,7 @@
 CC ?= cc
 CFLAGS ?= -O2 -Wall -Wextra -std=c89
 CPPFLAGS ?= -Isrc
-SRC = src/arena.c src/diag.c src/lexer.c src/ast.c src/parser.c src/types.c src/m7.c src/own.c src/check_m7.c src/lower.c src/emit_c_m7.c src/driver.c
+SRC = src/arena.c src/diag.c src/lexer.c src/ast.c src/parser.c src/types.c src/m7.c src/own.c src/check_m7.c src/lower.c src/emitcm7.c src/driver.c
 OBJ = $(SRC:.c=.o)
 
 .PHONY: all clean dos-build

fec/build-dos.bat

@@ -32,7 +32,7 @@ if errorlevel 1 goto build_fail
 wcl -q -za -wx -bt=dos -ml -k32768 -c -fo=lower.obj src\lower.c
 if errorlevel 1 goto build_fail
 rem Use an unambiguous short object name for the M7 emitter source.
-wcl -q -za -wx -bt=dos -ml -k32768 -c -fo=emitc.obj src\emit_c_m7.c
+wcl -q -za -wx -bt=dos -ml -k32768 -c -fo=emitc.obj src\emitcm7.c
 if errorlevel 1 goto build_fail
 wcl -q -za -wx -bt=dos -ml -k32768 -c -fo=driver.obj src\driver.c
 if errorlevel 1 goto build_fail

fec/src/check.c

@@ -811,6 +811,7 @@ static FeType *check_index(FeCheckerState *s, FeNode *n)
 static FeType *check_identifier(FeCheckerState *s, FeNode *n, int read)
 {
     FeSym *sym;
+    (void)read; /* TRIAL PATCH: silence W303 under the check_m7.c wrapper */
     sym = find_symbol(s->scope, n->text ? n->text : "");
     if (!sym) {
         FeType *named=fe_type_intern(&s->c->types,n->text ? n->text : "");

fec/src/check_m7.c

@@ -98,6 +98,7 @@ static FeType *m7_check_expected(FeCheckerState *s, FeNode *value,
     return actual;
 }
 
+/* TRIAL PATCH: m7_error_same was dead (W202); removed for this run.
 static int m7_error_same(FeCheckerState *s, FeType *a, FeType *b)
 {
     FeType *ea;
@@ -108,6 +109,7 @@ static int m7_error_same(FeCheckerState *s, FeType *a, FeType *b)
     eb=fe_m7_error_type(&s->c->types,b);
     return ea && eb && fe_type_equal(ea,eb);
 }
+*/
 
 static FeType *m7_member_field(FeCheckerState *s, FeNode *n, FeType *base)
 {