Rustup to rust-lang/rust#69592

clippy_lints/src/assertions_on_constants.rs

@@ -2,10 +2,10 @@ use crate::consts::{constant, Constant};
 use crate::utils::paths;
 use crate::utils::{is_direct_expn_of, is_expn_of, match_function_call, snippet_opt, span_lint_and_help};
 use if_chain::if_chain;
+use rustc_ast::ast::LitKind;
 use rustc_hir::{Expr, ExprKind, PatKind, UnOp};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
-use syntax::ast::LitKind;
 
 declare_clippy_lint! {
     /// **What it does:** Checks for `assert!(true)` and `assert!(false)` calls.