protected override object?Visit(Expression.Block block)
{
symbolTable.PushScope(ScopeKind.None);
base.Visit(block);
symbolTable.PopScope();
return(null);
}
protected override Value?Visit(Expression.Block block)
{
// We just compile statements and the optional value
foreach (var stmt in block.Statements)
{
Visit(stmt);
}
return(block.Value == null ? null : Visit(block.Value));
}
protected override Expression Visit(Expression.Block block)
{
var statements = block.Statements.Select(Desugar).ToArray();
var value = TransformNullable(block.Value);
if (value == null &&
statements.Length > 0 &&
statements.Last() is Statement.Expression_ expr &&
!expr.HasSemicolon &&
HasExplicitValue(expr.Expression))
{
// There was no return value, but the last statement was an expression without a semicolon
// Promote it to value
value = expr.Expression;
statements = statements.SkipLast(1).ToArray();
}
return(new Expression.Block(block.ParseTreeNode, statements, value));
}