use rustc_mir::dataflow::{Analysis, AnalysisDomain, GenKill, GenKillAnalysis, ResultsCursor};
use rustc_session::{declare_lint_pass, declare_tool_lint};
use rustc_span::source_map::{BytePos, Span};
+use rustc_span::sym;
use std::convert::TryFrom;
use std::ops::ControlFlow;
let from_borrow = match_def_path(cx, fn_def_id, &paths::CLONE_TRAIT_METHOD)
|| match_def_path(cx, fn_def_id, &paths::TO_OWNED_METHOD)
|| (match_def_path(cx, fn_def_id, &paths::TO_STRING_METHOD)
- && is_type_diagnostic_item(cx, arg_ty, sym!(string_type)));
+ && is_type_diagnostic_item(cx, arg_ty, sym::string_type));
let from_deref = !from_borrow
&& (match_def_path(cx, fn_def_id, &paths::PATH_TO_PATH_BUF)