Remove needless lifetimes

clippy_lints/src/consts.rs

@@ -154,7 +154,7 @@ impl Constant {
 }
 
 /// Parses a `LitKind` to a `Constant`.
-pub fn lit_to_constant<'tcx>(lit: &LitKind, ty: Ty<'tcx>) -> Constant {
+pub fn lit_to_constant(lit: &LitKind, ty: Ty<'_>) -> Constant {
     use syntax::ast::*;
 
     match *lit {

clippy_lints/src/missing_inline.rs

@@ -68,7 +68,7 @@ fn check_missing_inline_attrs(cx: &LateContext<'_, '_>, attrs: &[ast::Attribute]
     }
 }
 
-fn is_executable<'a, 'tcx>(cx: &LateContext<'a, 'tcx>) -> bool {
+fn is_executable<'a>(cx: &LateContext<'a, '_>) -> bool {
     use rustc::session::config::CrateType;
 
     cx.tcx.sess.crate_types.get().iter().any(|t: &CrateType| match t {

clippy_lints/src/utils/mod.rs

@@ -342,7 +342,7 @@ pub fn resolve_node(cx: &LateContext<'_, '_>, qpath: &QPath, id: HirId) -> Res {
 
 /// Returns the method names and argument list of nested method call expressions that make up
 /// `expr`.
-pub fn method_calls<'a>(expr: &'a Expr, max_depth: usize) -> (Vec<Symbol>, Vec<&'a [Expr]>) {
+pub fn method_calls(expr: &Expr, max_depth: usize) -> (Vec<Symbol>, Vec<&[Expr]>) {
     let mut method_names = Vec::with_capacity(max_depth);
     let mut arg_lists = Vec::with_capacity(max_depth);