stage1 修复错误 提供类型检查

stage1/spl_comp.h

@@ -77,6 +77,8 @@ typedef struct spl_comp {
     /* Error state */
     char error_msg[COMP_ERROR_MAX];
     int has_error;
+    usize error_line;
+    usize error_col;
 
     /* Scopes */
     spl_scope_vec_t scopes;
@@ -91,6 +93,7 @@ typedef struct spl_comp {
     /* Current function context */
     int current_func_idx;
     int current_ret_type_idx;
+    char parse_context[COMP_ERROR_MAX]; /* current parsing context for error messages */
 
     /* Loop context for break/continue */
     int in_loop;
@@ -124,6 +127,7 @@ void spl_comp_reset(spl_comp_t *ctx);
 
 /* Error reporting */
 void spl_comp_error(spl_comp_t *ctx, const char *fmt, ...);
+void spl_comp_err_tok(spl_comp_t *ctx, spl_tok_t *tok, const char *fmt, ...);
 
 /* ============================================================
  * Parser functions (spl_parser.c)