fix: give for statement bodies a higher `dynamic` precedence to avoid parse errors

grammar.js

@@ -84,6 +84,8 @@ module.exports = grammar(C, {
     [$._function_declarator_seq],
     [$._type_specifier, $.sized_type_specifier],
     [$.initializer_pair, $.comma_expression],
+    [$.expression_statement, $._for_statement_body],
+    [$.init_statement, $._for_statement_body],
   ],
 
   inline: ($, original) => original.concat([
@@ -821,7 +823,10 @@ module.exports = grammar(C, {
       optional(field('alternative', $.else_clause)),
     )),
 
-    _for_statement_body: ($, original) => prec(1, original),
+    // Using prec(1) instead of prec.dynamic(1) causes issues with the
+    // range loop's declaration specifiers if `int` is passed in, it'll
+    // always prefer the standard for loop and give us a parse error.
+    _for_statement_body: ($, original) => prec.dynamic(1, original),
     for_range_loop: $ => seq(
       'for',
       '(',

test/corpus/statements.txt

@@ -44,6 +44,8 @@ T main() {
   for (using elem_t = T::value_type; elem_t i : v) {
     cout << --n + i << ' ';
   }
+
+  for (int x; int v : {1}) {}
 }
 
 --------------------------------------------------------------------------------
@@ -140,7 +142,17 @@ T main() {
                     argument: (identifier))
                   right: (identifier)))
               right: (char_literal
-                (character)))))))))
+                (character))))))
+      (for_range_loop
+        initializer: (init_statement
+          (declaration
+            type: (primitive_type)
+            declarator: (identifier)))
+        type: (primitive_type)
+        declarator: (identifier)
+        right: (initializer_list
+          (number_literal))
+        body: (compound_statement)))))
 
 ================================================================================
 Constexpr if statements