Rustup to https://github.com/rust-lang/rust/pull/67853

Specifically caused by https://github.com/rust-lang/rust/pull/67786

clippy_lints/src/enum_variants.rs

@@ -5,9 +5,9 @@ use crate::utils::{span_help_and_lint, span_lint};
 use rustc::impl_lint_pass;
 use rustc::lint::{EarlyContext, EarlyLintPass, Lint, LintArray, LintPass};
 use rustc_session::declare_tool_lint;
+use rustc_span::source_map::Span;
+use rustc_span::symbol::Symbol;
 use syntax::ast::*;
-use syntax::source_map::Span;
-use syntax::symbol::Symbol;
 
 declare_clippy_lint! {
     /// **What it does:** Detects enumeration variants that are prefixed or suffixed