Disallow await inside arrow functions (#9074)

* Disallow await inside arrow functions

* Update test262 whitelist

packages/babel-parser/src/parser/expression.js

@@ -1716,7 +1716,7 @@ export default class ExpressionParser extends LValParser {
     const oldInAsync = this.state.inAsync;
     const oldInGenerator = this.state.inGenerator;
     const oldMaybeInArrowParameters = this.state.maybeInArrowParameters;
-    this.state.inAsync = true;
+    this.state.inAsync = isAsync;
     this.state.inGenerator = false;
     this.state.maybeInArrowParameters = false;
     this.parseFunctionBody(node, true);

packages/babel-parser/test/fixtures/es2017/async-functions/await-inside-arrow-expression-disallowed/input.js

@@ -0,0 +1 @@
+() => { await x }

packages/babel-parser/test/fixtures/es2017/async-functions/await-inside-arrow-expression-disallowed/options.json

@@ -0,0 +1,3 @@
+{
+  "throws": "Unexpected token, expected \";\" (1:14)"
+}

packages/babel-parser/test/fixtures/es2017/async-functions/await-inside-arrow-identifier-allowed/input.js

@@ -0,0 +1 @@
+() => { await }

packages/babel-parser/test/fixtures/es2017/async-functions/await-inside-arrow-identifier-allowed/options.json

@@ -0,0 +1,3 @@
+{
+  "sourceType": "script"
+}

packages/babel-parser/test/fixtures/es2017/async-functions/await-inside-arrow-identifier-allowed/output.json

@@ -0,0 +1,119 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 15,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 15
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 15,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 15
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 15,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 15
+          }
+        },
+        "expression": {
+          "type": "ArrowFunctionExpression",
+          "start": 0,
+          "end": 15,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 15
+            }
+          },
+          "id": null,
+          "generator": false,
+          "async": false,
+          "params": [],
+          "body": {
+            "type": "BlockStatement",
+            "start": 6,
+            "end": 15,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 6
+              },
+              "end": {
+                "line": 1,
+                "column": 15
+              }
+            },
+            "body": [
+              {
+                "type": "ExpressionStatement",
+                "start": 8,
+                "end": 13,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 8
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 13
+                  }
+                },
+                "expression": {
+                  "type": "Identifier",
+                  "start": 8,
+                  "end": 13,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 8
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 13
+                    },
+                    "identifierName": "await"
+                  },
+                  "name": "await"
+                }
+              }
+            ],
+            "directives": []
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}

scripts/tests/test262/test262_whitelist.txt

@@ -1654,8 +1654,6 @@ language/statements/switch/syntax/redeclaration/let-declaration-attempt-to-redec
 language/statements/switch/syntax/redeclaration/let-declaration-attempt-to-redeclare-with-async-generator-declaration.js(strict mode)
 language/statements/switch/syntax/redeclaration/var-declaration-attempt-to-redeclare-with-async-generator-declaration.js(default)
 language/statements/switch/syntax/redeclaration/var-declaration-attempt-to-redeclare-with-async-generator-declaration.js(strict mode)
-language/expressions/dynamic-import/assignment-expression/await-identifier.js(default)
-language/expressions/dynamic-import/assignment-expression/await-identifier.js(strict mode)
 language/literals/regexp/named-groups/invalid-dangling-groupname-2-u.js(default)
 language/literals/regexp/named-groups/invalid-dangling-groupname-2-u.js(strict mode)
 language/literals/regexp/named-groups/invalid-dangling-groupname-2.js(default)