From 72503ca9301568cc9d53a295d2dbd115bcf19dd8 Mon Sep 17 00:00:00 2001
From: Matt Corallo <git@bluematt.me>
Date: Fri, 23 Sep 2022 18:57:13 +0000
Subject: [PATCH] Don't use a turbofish when all parameters are lifetimes.

For some reason rustc doesn't like this, and its easy, so whatever.
---
 c-bindings-gen/src/main.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/c-bindings-gen/src/main.rs b/c-bindings-gen/src/main.rs
index 2aeadaf..b07bb26 100644
--- a/c-bindings-gen/src/main.rs
+++ b/c-bindings-gen/src/main.rs
@@ -1125,6 +1125,14 @@ fn writeln_impl<W: std::io::Write>(w: &mut W, i: &syn::ItemImpl, types: &mut Typ
 										if idx != 0 { t_gen_args += ", " };
 										t_gen_args += "_"
 									}
+									// rustc doesn't like <_> if the _ is actually a lifetime, so
+									// if all the parameters are lifetimes just skip it.
+									let mut nonlifetime_param = false;
+									for param in $trait.generics.params.iter() {
+										if let syn::GenericParam::Lifetime(_) = param {}
+										else { nonlifetime_param = true; }
+									}
+									if !nonlifetime_param { t_gen_args = String::new(); }
 									if takes_self {
 										write!(w, "<native{} as {}<{}>>::{}(unsafe {{ &mut *(this_arg as *mut native{}) }}, ", ident, $trait_path, t_gen_args, $m.sig.ident, ident).unwrap();
 									} else {
-- 
2.39.5