3 files changed, 6 insertions, 6 deletions
diff --git a/src/libsyntax_ext/assert.rs b/src/libsyntax_ext/assert.rs
index 10d323ffb89..637614a18bc 100644
--- a/src/libsyntax_ext/assert.rs
+++ b/src/libsyntax_ext/assert.rs
@@ -131,7 +131,7 @@ fn parse_assert<'a>(
     Ok(Assert { cond_expr, custom_message })
 }
 
-fn parse_custom_message<'a>(parser: &mut Parser<'a>) -> Option<TokenStream> {
+fn parse_custom_message(parser: &mut Parser<'_>) -> Option<TokenStream> {
     let ts = parser.parse_tokens();
     if !ts.is_empty() {
         Some(ts)
diff --git a/src/libsyntax_ext/deriving/generic/mod.rs b/src/libsyntax_ext/deriving/generic/mod.rs
index 444cf1263ce..12482f7248e 100644
--- a/src/libsyntax_ext/deriving/generic/mod.rs
+++ b/src/libsyntax_ext/deriving/generic/mod.rs
@@ -331,8 +331,8 @@ pub type CombineSubstructureFunc<'a> =
 pub type EnumNonMatchCollapsedFunc<'a> =
     Box<dyn FnMut(&mut ExtCtxt<'_>, Span, (&[Ident], &[Ident]), &[P<Expr>]) -> P<Expr> + 'a>;
 
-pub fn combine_substructure<'a>(f: CombineSubstructureFunc<'a>)
-                                -> RefCell<CombineSubstructureFunc<'a>> {
+pub fn combine_substructure(f: CombineSubstructureFunc<'_>)
+                            -> RefCell<CombineSubstructureFunc<'_>> {
     RefCell::new(f)
 }
 
diff --git a/src/libsyntax_ext/deriving/generic/ty.rs b/src/libsyntax_ext/deriving/generic/ty.rs
index 90d826429da..02b02e9b836 100644
--- a/src/libsyntax_ext/deriving/generic/ty.rs
+++ b/src/libsyntax_ext/deriving/generic/ty.rs
@@ -39,10 +39,10 @@ pub enum PathKind {
 }
 
 impl<'a> Path<'a> {
-    pub fn new<'r>(path: Vec<&'r str>) -> Path<'r> {
+    pub fn new(path: Vec<&str>) -> Path<'_> {
         Path::new_(path, None, Vec::new(), PathKind::Std)
     }
-    pub fn new_local<'r>(path: &'r str) -> Path<'r> {
+    pub fn new_local(path: &str) -> Path<'_> {
         Path::new_(vec![path], None, Vec::new(), PathKind::Local)
     }
     pub fn new_<'r>(path: Vec<&'r str>,
@@ -117,7 +117,7 @@ pub enum Const {
 pub fn borrowed_ptrty<'r>() -> PtrTy<'r> {
     Borrowed(None, ast::Mutability::Immutable)
 }
-pub fn borrowed<'r>(ty: Box<Ty<'r>>) -> Ty<'r> {
+pub fn borrowed(ty: Box<Ty<'_>>) -> Ty<'_> {
     Ptr(ty, borrowed_ptrty())
 }