[bcel] Invalid Method Signature when parentheses are in method name

[Jason Copenhaver]

I've run into an issue when using BCEL on the results of the below Kotlin
code.

class test {
    fun takeABlock(a: () -> Unit) {
        a()
    }

    fun `method name with () in it`() {
        takeABlock { println("other test") }
    }

    fun `method name without parens`() {
        takeABlock { println("other test") }
    }
}

Three class files are produced.

test$method name with () in it$1.class
test$method name without parens$1.class
test.class

When i use the examples/JasminVisitor.java against `test$method name with
() in it$1.class` with a small patch to add a `field.getType()` call to the
`visitField` method  I get the below stack trace.

Exception in thread "main" org.apache.bcel.classfile.ClassFormatException:
Invalid method signature:  in it$1;
at org.apache.bcel.classfile.Utility.typeOfSignature(Utility.java:1284)
at org.apache.bcel.generic.Type.getType(Type.java:227)
at org.apache.bcel.generic.Type.getReturnType(Type.java:151)
at org.apache.bcel.classfile.Field.getType(Field.java:150)
at JasminVisitor.visitField(JasminVisitor.java:287)
at org.apache.bcel.classfile.Field.accept(Field.java:113)
at
org.apache.bcel.classfile.DescendingVisitor.visitField(DescendingVisitor.java:311)
at org.apache.bcel.classfile.Field.accept(Field.java:113)
at
org.apache.bcel.classfile.DescendingVisitor.lambda$accept$0(DescendingVisitor.java:44)
at
java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
at
java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:658)
at
org.apache.bcel.classfile.DescendingVisitor.accept(DescendingVisitor.java:44)
at
org.apache.bcel.classfile.DescendingVisitor.visitJavaClass(DescendingVisitor.java:335)
at org.apache.bcel.classfile.JavaClass.accept(JavaClass.java:251)
at
org.apache.bcel.classfile.DescendingVisitor.visit(DescendingVisitor.java:77)
at JasminVisitor.disassemble(JasminVisitor.java:109)
at JasminVisitor.main(JasminVisitor.java:82)

Thanks,
Jason C