int foo(int x) {
    return x;
}

#11 = Utf8               foo
#12 = Utf8               (I)I        // 1
#13 = Utf8               x
#14 = Utf8               I           // 2

interface I { int foo(int x); }
class X {
I x = (int x1) -> 0;
}

 #15 = Utf8            lambda$new$0
 #16 = Utf8            (I)I
 #17 = Utf8            x1
 #18 = Utf8            I

MethodDescriptor:
    ( ParameterDescriptor* ) ReturnDescriptor

ParameterDescriptor:
    FieldType

ReturnDescriptor:
    FieldType
    VoidDescriptor

VoidDescriptor:
    V

javap

#123 = NameAndType      #11:#12;   // "foo":(I)I