Just ran into a fun failed assertion with metadata extraction in the scriptbuilder addon:

class Bar {}
class Foo { Foo(const Bar &in b) {} }

[Metadata]
Foo Test(Bar());

This fails because the declaration is wrongly extracted in CScriptBuilder::ExtractDeclaration. The name field actually becomes Bar here, and the declaration contains the entire line of code.

As a workaround, this seems to work, but requires a default constructor:

class Bar {}
class Foo {
	Foo() {}
	Foo(const Bar &in b) {}
}

[Metadata]
Foo Test = Foo(Bar());