ParseException when processing nested Annotations

[DPUkyle]

In Lab, create three files:

1. Java type MuhAnnotation

package scratch;

@java.lang.annotation.Target({java.lang.annotation.ElementType.TYPE})
@java.lang.annotation.Retention(java.lang.annotation.RetentionPolicy.RUNTIME)
@java.lang.annotation.Inherited
public @interface MuhAnnotation {
  public MuhSubAnnotation[] muhSubs() default {@MuhSubAnnotation("")};
}

2. Java type MuhSubAnnotation

package scratch;

@java.lang.annotation.Target({java.lang.annotation.ElementType.METHOD})
@java.lang.annotation.Retention(java.lang.annotation.RetentionPolicy.RUNTIME)
public @interface MuhSubAnnotation {
  java.lang.String value();
}

3. Gosu type MuhClass

package scratch

@MuhAnnotation
class MuhClass {}

Parsing MuhClass will complain that Error: (3, 1) No default constructor in scratch.MuhAnnotation.

I think this is a red herring. But the real error is that MuhAnnotation has ParseExceptions as it doesn't expect the nested type MuhSubAnnotation.

Using a similar example and using the command-line compiler, I can reproduce this ST:

Exception in thread "main" gw.lang.parser.exceptions.ParseResultsException: Errors: 

Unexpected token: '}' [line:1 col:38] in
line 1: {@scratch.MuhSubAnnotation(:value="")}
Line Number: 1  Column: 38

Expecting '}' to close statement block. [line:1 col:38] in
line 1: {@scratch.MuhSubAnnotation(:value="")}
Line Number: 1  Column: 38


	at gw.internal.gosu.parser.ParserBase.verifyParsedElement(ParserBase.java:292)
	at gw.internal.gosu.parser.ParserBase.verifyParsedElement(ParserBase.java:263)
	at gw.internal.gosu.parser.GosuParser.parseProgram(GosuParser.java:811)
	at gw.internal.gosu.parser.GosuParser.parseProgram(GosuParser.java:732)
	at gw.internal.gosu.parser.GosuParser.parseProgram(GosuParser.java:727)
	at gw.internal.gosu.parser.GosuParser.parseProgram(GosuParser.java:722)
	at gw.internal.gosu.parser.GosuParser.parseExpOrProgram(GosuParser.java:1083)
	at gw.internal.gosu.parser.java.classinfo.CompileTimeExpressionParser.parse(CompileTimeExpressionParser.java:66)
	at gw.internal.gosu.parser.AnnotationConstructorGenerator.makeDefaultValueExpression(AnnotationConstructorGenerator.java:201)
	at gw.internal.gosu.parser.AnnotationConstructorGenerator.makeLegacyAllArgsAnnotationConstructor(AnnotationConstructorGenerator.java:181)
	at gw.internal.gosu.parser.AnnotationConstructorGenerator.addLegacyConstructors(AnnotationConstructorGenerator.java:60)
	at gw.internal.gosu.parser.AnnotationConstructorGenerator.generateAnnotationConstructors(AnnotationConstructorGenerator.java:44)
	at gw.internal.gosu.parser.JavaTypeInfo$3.init(JavaTypeInfo.java:237)
	at gw.internal.gosu.parser.JavaTypeInfo$3.init(JavaTypeInfo.java:231)
	at gw.util.concurrent.LockingLazyVar.get(LockingLazyVar.java:53)
	at gw.internal.gosu.parser.JavaTypeInfo.getDeclaredConstructors(JavaTypeInfo.java:418)
	at gw.lang.reflect.FeatureManager.maybeInitConstructors(FeatureManager.java:434) - (scratch.MuhAnnotation)
	at gw.lang.reflect.FeatureManager.getConstructors(FeatureManager.java:250)
	at gw.internal.gosu.parser.JavaTypeInfo.getConstructors(JavaTypeInfo.java:377)
	at gw.internal.gosu.parser.JavaTypeInfo.getConstructors(JavaTypeInfo.java:371)
	at gw.internal.gosu.parser.JavaTypeInfo.getConstructor(JavaTypeInfo.java:396)
	at gw.internal.gosu.parser.GosuParser.parseNewExpressionOrAnnotation(GosuParser.java:4557)
	at gw.internal.gosu.parser.GosuParser._parseNewExpressionOrAnnotation(GosuParser.java:4304)
	at gw.internal.gosu.parser.GosuParser.parseNewExpressionOrAnnotation(GosuParser.java:4251)
	at gw.internal.gosu.parser.ParserBase.parseAnnotation(ParserBase.java:1869)
	at gw.internal.gosu.parser.ParserBase.parseModifiers(ParserBase.java:1674)
	at gw.internal.gosu.parser.GosuClassParser.parseModifiersForClass(GosuClassParser.java:2032)
	at gw.internal.gosu.parser.GosuClassParser.parseClassType(GosuClassParser.java:1901)
	at gw.internal.gosu.parser.GosuClassParser.parseHeader(GosuClassParser.java:1706)
	at gw.internal.gosu.parser.GosuClassParser.parseDefinitions(GosuClassParser.java:415)
	at gw.internal.gosu.parser.GosuClass.compileDefinitionsIfNeeded(GosuClass.java:1551)
	at gw.internal.gosu.parser.GosuClass.compileDefinitionsIfNeeded(GosuClass.java:1494)
	at gw.internal.gosu.parser.GosuClass.isValid(GosuClass.java:925)
	at gw.internal.gosu.parser.GosuClass_Proxy.isValid(gw.internal.gosu.parser.GosuClass_Proxy:2)
	at gw.lang.gosuc.simple.GosuCompiler.compile(GosuCompiler.java:267)
	at gw.lang.gosuc.simple.GosuCompiler.compileGosuSources(GosuCompiler.java:194)
	at gw.lang.gosuc.simple.GosuCompiler.compile(GosuCompiler.java:112)
	at gw.lang.gosuc.cli.CommandLineCompiler.execute(CommandLineCompiler.java:81)
	at gw.lang.gosuc.cli.CommandLineCompiler.invoke(CommandLineCompiler.java:42)
	at gw.lang.gosuc.cli.CommandLineCompiler.main(CommandLineCompiler.java:32)

You can find this example at https://github.com/gosu-lang/example-gradle-hybrid/tree/anno. Clone the repo, checkout branch anno then run ./gradlew clean compileGosu

[DPUkyle]

AnnotationConstructorGenerator.makeDefaultValueExpression seems suspicious here.