move assert to expression

Author: aspeddro

grammar.js

@@ -123,7 +123,6 @@ module.exports = grammar({
       $.expression_statement,
       $.declaration,
       $.open_statement,
-      $.assert_statement,
       $.include_statement,
     ),
 
@@ -461,6 +460,7 @@ module.exports = grammar({
       $.mutation_expression,
       $.await_expression,
       $.block,
+      $.assert_expression,
     ),
 
     primary_expression: $ => choice(
@@ -695,7 +695,7 @@ module.exports = grammar({
       optional($.type_annotation)
     )),
 
-    assert_statement: $ => seq('assert', $.expression),
+    assert_expression: $ => prec.left(seq('assert', $.expression)),
 
     call_expression: $ => prec('call', seq(
       field('function', $.primary_expression),

test/corpus/expressions.txt

@@ -1189,17 +1189,25 @@ Assert expression
 
 assert false
 assert { 1 > 2 }
+let f = () => assert false
 
 ---
 
 (source_file
-  (assert_statement (false))
-  (assert_statement
-    (block
-      (expression_statement
-        (binary_expression
-          (number)
-          (number))))))
+  (expression_statement
+    (assert_expression (false)))
+  (expression_statement
+    (assert_expression
+      (block
+        (expression_statement
+          (binary_expression
+            (number)
+            (number))))))
+  (let_binding
+    (value_identifier)
+    (function
+      (formal_parameters)
+      (assert_expression (false)))))
 
 ============================================
 Try-catch