1 files changed, 26 insertions, 2 deletions
diff --git a/rust/macros/quote.rs b/rust/macros/quote.rs
index 33a199e4f176..92cacc4067c9 100644
--- a/rust/macros/quote.rs
+++ b/rust/macros/quote.rs
@@ -2,6 +2,7 @@
 
 use proc_macro::{TokenStream, TokenTree};
 
+#[allow(dead_code)]
 pub(crate) trait ToTokens {
     fn to_tokens(&self, tokens: &mut TokenStream);
 }
@@ -20,6 +21,12 @@ impl ToTokens for proc_macro::Group {
     }
 }
 
+impl ToTokens for proc_macro::Ident {
+    fn to_tokens(&self, tokens: &mut TokenStream) {
+        tokens.extend([TokenTree::from(self.clone())]);
+    }
+}
+
 impl ToTokens for TokenTree {
     fn to_tokens(&self, tokens: &mut TokenStream) {
         tokens.extend([self.clone()]);
@@ -40,7 +47,7 @@ impl ToTokens for TokenStream {
 /// `quote` crate but provides only just enough functionality needed by the current `macros` crate.
 macro_rules! quote_spanned {
     ($span:expr => $($tt:tt)*) => {{
-        let mut tokens;
+        let mut tokens: ::std::vec::Vec<::proc_macro::TokenTree>;
         #[allow(clippy::vec_init_then_push)]
         {
             tokens = ::std::vec::Vec::new();
@@ -65,7 +72,8 @@ macro_rules! quote_spanned {
         quote_spanned!(@proc $v $span $($tt)*);
     };
     (@proc $v:ident $span:ident ( $($inner:tt)* ) $($tt:tt)*) => {
-        let mut tokens = ::std::vec::Vec::new();
+        #[allow(unused_mut)]
+        let mut tokens = ::std::vec::Vec::<::proc_macro::TokenTree>::new();
         quote_spanned!(@proc tokens $span $($inner)*);
         $v.push(::proc_macro::TokenTree::Group(::proc_macro::Group::new(
             ::proc_macro::Delimiter::Parenthesis,
@@ -136,6 +144,22 @@ macro_rules! quote_spanned {
         ));
         quote_spanned!(@proc $v $span $($tt)*);
     };
+    (@proc $v:ident $span:ident = $($tt:tt)*) => {
+        $v.push(::proc_macro::TokenTree::Punct(
+                ::proc_macro::Punct::new('=', ::proc_macro::Spacing::Alone)
+        ));
+        quote_spanned!(@proc $v $span $($tt)*);
+    };
+    (@proc $v:ident $span:ident # $($tt:tt)*) => {
+        $v.push(::proc_macro::TokenTree::Punct(
+                ::proc_macro::Punct::new('#', ::proc_macro::Spacing::Alone)
+        ));
+        quote_spanned!(@proc $v $span $($tt)*);
+    };
+    (@proc $v:ident $span:ident _ $($tt:tt)*) => {
+        $v.push(::proc_macro::TokenTree::Ident(::proc_macro::Ident::new("_", $span)));
+        quote_spanned!(@proc $v $span $($tt)*);
+    };
     (@proc $v:ident $span:ident $id:ident $($tt:tt)*) => {
         $v.push(::proc_macro::TokenTree::Ident(::proc_macro::Ident::new(stringify!($id), $span)));
         quote_spanned!(@proc $v $span $($tt)*);