gistfile1.rs

fn find_fn(ccx: @mut CrateContext, fn_id: ast::node_id) -> Option<codemap::span> {
    match ccx.tcx.def_map.find(&fn_id) {
        Some(&ast::def_fn(def_id, _)) => {
    
            if ast_util::is_local(def_id) {
                match ccx.tcx.items.find(&def_id.node) {
                    Some(&ast_map::node_item(item, _)) => {
                        match item.node {
                            ast::item_fn(*) => Some(item.span),
                            _ => None
                        }   
                    }   
                    None => None
                }   
            } else {
                let search = csearch::maybe_get_item_ast(
                    ccx.tcx, def_id,
                    |a, b, c, d| astencode::decode_inlined_item(a, b, ccx.maps(), c.clone(), d));

                match search {
                    csearch::found(ast::ii_item(item)) => {
                        match item.node {
                            ast::item_fn(*) => Some(item.span),
                            _ => None
                        }   
                    }   
                    _ => None
                }   
            }   

        }   
        _ => None
    }   
}