clone method
Create a copy of this declaration, mainly used on class member inheritance and function arguments passing.
Implementation
@override
HTVariableDeclaration clone() => HTVariableDeclaration(
id: id!,
classId: classId,
closure: closure,
source: source,
declType: declType,
isExternal: isExternal,
isStatic: isStatic,
isMutable: isMutable,
isTopLevel: isTopLevel);