Allows the interface to be used as an Identifier for flow plugin (#12254)

packages/babel-parser/test/fixtures/flow/interfaces-as-identifier/binary-expression/input.js

@@ -0,0 +1 @@
+interface + 3;

packages/babel-parser/test/fixtures/flow/interfaces-as-identifier/binary-expression/output.json

@@ -0,0 +1,39 @@
+{
+  "type": "File",
+  "start":0,"end":14,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":14}},
+  "errors": [
+    "SyntaxError: Unexpected reserved word 'interface' (1:0)"
+  ],
+  "program": {
+    "type": "Program",
+    "start":0,"end":14,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":14}},
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start":0,"end":14,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":14}},
+        "expression": {
+          "type": "BinaryExpression",
+          "start":0,"end":13,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":13}},
+          "left": {
+            "type": "Identifier",
+            "start":0,"end":9,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":9},"identifierName":"interface"},
+            "name": "interface"
+          },
+          "operator": "+",
+          "right": {
+            "type": "NumericLiteral",
+            "start":12,"end":13,"loc":{"start":{"line":1,"column":12},"end":{"line":1,"column":13}},
+            "extra": {
+              "rawValue": 3,
+              "raw": "3"
+            },
+            "value": 3
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}