Use Keyword.isPseudo to translate Fasta's "pseudo-keywords" properly.

pkg/front_end/test/scanner_test.dart

Index: pkg/front_end/test/scanner_test.dart
diff --git a/pkg/front_end/test/scanner_test.dart b/pkg/front_end/test/scanner_test.dart
index aea7bf5f7e609571c698aef6a87c8797dc8896f1..caddea4c6625f146ae463acaeea0796273a07c92 100644
--- a/pkg/front_end/test/scanner_test.dart
+++ b/pkg/front_end/test/scanner_test.dart
@@ -541,6 +541,10 @@ abstract class ScannerTestBase {
     _assertKeywordToken("get");
   }
 
+  void test_keyword_hide() {
+    _assertIdentifierToken("hide");
+  }
+
   void test_keyword_if() {
     _assertKeywordToken("if");
   }
@@ -565,6 +569,10 @@ abstract class ScannerTestBase {
     _assertKeywordToken("library");
   }
 
+  void test_keyword_native() {
+    _assertIdentifierToken("native");
+  }
+
   void test_keyword_new() {
     _assertKeywordToken("new");
   }
@@ -573,6 +581,14 @@ abstract class ScannerTestBase {
     _assertKeywordToken("null");
   }
 
+  void test_keyword_of() {
+    _assertIdentifierToken("of");
+  }
+
+  void test_keyword_on() {
+    _assertIdentifierToken("on");
+  }
+
   void test_keyword_operator() {
     _assertKeywordToken("operator");
   }
@@ -581,6 +597,10 @@ abstract class ScannerTestBase {
     _assertKeywordToken("part");
   }
 
+  void test_keyword_patch() {
+    _assertIdentifierToken("patch");
+  }
+
   void test_keyword_rethrow() {
     _assertKeywordToken("rethrow");
   }
@@ -593,6 +613,14 @@ abstract class ScannerTestBase {
     _assertKeywordToken("set");
   }
 
+  void test_keyword_show() {
+    _assertIdentifierToken("show");
+  }
+
+  void test_keyword_source() {
+    _assertIdentifierToken("source");
+  }
+
   void test_keyword_static() {
     _assertKeywordToken("static");
   }
@@ -645,6 +673,10 @@ abstract class ScannerTestBase {
     _assertKeywordToken("with");
   }
 
+  void test_keyword_yield() {
+    _assertIdentifierToken("yield");
+  }
+
   void test_lt() {
     _assertToken(TokenType.LT, "<");
   }