Repair Method#parameters and return [:rest] without name for methods implemented with #method_missing

Author: andrykonchin

src/main/java/org/truffleruby/language/methods/SharedMethodInfo.java

@@ -91,7 +91,7 @@ public SharedMethodInfo convertMethodMissingToMethod(RubyModule declaringModule,
                 blockDepth,
                 moduleAndMethodName(declaringModule, methodName),
                 notes,
-                ArgumentDescriptor.ANY);
+                ArgumentDescriptor.ANY_UNNAMED);
     }
 
     public SourceSection getSourceSection() {

src/main/java/org/truffleruby/parser/ArgumentDescriptor.java

@@ -36,7 +36,7 @@ public final class ArgumentDescriptor {
     /** The name of the argument */
     public final String name;
 
-    public static final ArgumentDescriptor[] ANY = { new ArgumentDescriptor(ArgumentType.anonrest) };
+    public static final ArgumentDescriptor[] ANY_UNNAMED = { new ArgumentDescriptor(ArgumentType.unnamedrest) };
     public static final ArgumentDescriptor[] AT_LEAST_ONE = {
             new ArgumentDescriptor(ArgumentType.anonreq),
             new ArgumentDescriptor(ArgumentType.anonrest) };

src/main/java/org/truffleruby/parser/ArgumentType.java

@@ -40,6 +40,7 @@ public enum ArgumentType {
     anonrest("rest", true),
     anonkeyrest("keyrest", true),
     anonblock("block", true),
+    unnamedrest("rest", true),
     nokey("nokey", true); // **nil
 
     ArgumentType(String symbolicName, boolean anonymous) {