cover zeroOrMoreCharsIn() compile-time

Author: fluentfuture

mug-errorprone/src/main/java/com/google/mu/errorprone/CharacterSetLiteralCheck.java

@@ -45,6 +45,7 @@ public final class CharacterSetLiteralCheck extends AbstractBugChecker
     implements AbstractBugChecker.MethodInvocationCheck {
   private static final Matcher<ExpressionTree> MATCHER = Matchers.anyOf(
       staticMethod().onClass("com.google.common.labs.parse.Parser").named("anyCharIn"),
+      staticMethod().onClass("com.google.common.labs.parse.Parser").named("zeroOrMoreCharsIn"),
       staticMethod().onClass("com.google.common.labs.parse.Parser").named("oneOrMoreCharsIn"));
 
   @Override

mug-errorprone/src/test/java/com/google/mu/errorprone/CharacterSetLiteralCheckTest.java

@@ -45,7 +45,7 @@ public void missingSquareBrackets() {
             "Test.java",
             "import com.google.common.labs.parse.Parser;",
             "class Test {",
-            "  private static final Parser<?> PARSER = Parser.anyCharIn(",
+            "  private static final Parser<?>.OrEmpty PARSER = Parser.zeroOrMoreCharsIn(",
             "      // BUG: Diagnostic contains: Use [a-zA-Z] instead",
             "      \"a-zA-Z\");",
             "}")