# Unnamed constant

const _: () = ();

==>

SourceFile(ConstItem(const, _, UnitType, UnitExpression))

# Repeated unnamed constants

const _: u8 = 1; const _: u8 = 2;

==>

SourceFile(
  ConstItem(const, _, TypeIdentifier, Integer),
  ConstItem(const, _, TypeIdentifier, Integer))

# Unnamed constant inside a block

fn f() { const _: () = {}; }

==>

SourceFile(
  FunctionItem(fn, BoundIdentifier, ParamList, Block(ConstItem(const, _, UnitType, Block))))