keywords are not allowed as local specifier (#307)

Also fix some error messages to be more specific

test/fixtures/es2015/modules/import-invalid-keyword-flow/actual.js

@@ -0,0 +1 @@
+import { default } from "foo";

test/fixtures/es2015/modules/import-invalid-keyword-flow/options.json

@@ -0,0 +1,4 @@
+{
+  "plugins": ["flow"],
+  "throws": "default is a reserved word (1:9)"
+}

test/fixtures/es2015/modules/import-invalid-keyword-typeof-flow/actual.js

@@ -0,0 +1 @@
+import { typeof } from "foo";

test/fixtures/es2015/modules/import-invalid-keyword-typeof-flow/options.json

@@ -0,0 +1,4 @@
+{
+  "plugins": ["flow"],
+  "throws": "typeof is a reserved word (1:9)"
+}

test/fixtures/es2015/modules/import-invalid-keyword-typeof/actual.js

@@ -0,0 +1 @@
+import { typeof } from "foo";

test/fixtures/es2015/modules/import-invalid-keyword-typeof/options.json

@@ -0,0 +1,3 @@
+{
+  "throws": "typeof is a reserved word (1:9)"
+}

test/fixtures/es2015/modules/import-invalid-keyword/actual.js

@@ -0,0 +1 @@
+import { debugger } from "foo";

test/fixtures/es2015/modules/import-invalid-keyword/options.json

@@ -0,0 +1,3 @@
+{
+  "throws": "debugger is a reserved word (1:9)"
+}

test/fixtures/esprima/es2015-yield/invalid-yield-generator-declaration/options.json

@@ -1,3 +1,3 @@
 {
-  "throws": "Unexpected token (1:26)"
-}
+  "throws": "yield is a reserved word (1:26)"
+}

test/fixtures/esprima/es2015-yield/invalid-yield-generator-function-declaration/options.json

@@ -1,3 +1,3 @@
 {
-  "throws": "Unexpected token (1:25)"
-}
+  "throws": "yield is a reserved word (1:25)"
+}

test/fixtures/esprima/es2015-yield/invalid-yield-generator-strict-function-expression/options.json

@@ -1,3 +1,3 @@
 {
-  "throws": "Unexpected token (1:46)"
-}
+  "throws": "yield is a reserved word (1:46)"
+}

test/fixtures/esprima/es2015-yield/invalid-yield-strict-identifier/options.json

@@ -1,3 +1,3 @@
 {
-  "throws": "Unexpected token (1:29)"
+  "throws": "yield is a reserved word (1:29)"
 }

test/fixtures/esprima/es2015-yield/invalid-yield-strict-rest-parameter/options.json

@@ -1,3 +1,3 @@
 {
-  "throws": "Unexpected token (1:28)"
-}
+  "throws": "yield is a reserved word (1:28)"
+}

test/fixtures/flow/type-imports/invalid-import-type-as/actual.js

@@ -0,0 +1 @@
+import { type as debugger } from "foo";

test/fixtures/flow/type-imports/invalid-import-type-as/options.json

@@ -0,0 +1,3 @@
+{
+  "throws": "debugger is a reserved word (1:17)"
+}

test/fixtures/flow/type-imports/invalid-import-type/actual.js

@@ -0,0 +1 @@
+import { type debugger } from "foo";

test/fixtures/flow/type-imports/invalid-import-type/options.json

@@ -0,0 +1,3 @@
+{
+  "throws": "debugger is a reserved word (1:9)"
+}

test/fixtures/flow/type-parameter-declaration/reserved-word-class-name-failure/options.json

@@ -1,4 +1,4 @@
 {
-  "throws": "Unexpected token (1:14)",
+  "throws": "delete is a reserved word (1:14)",
   "plugins": ["flow", "jsx"]
 }