From c725cd2feb22b9d9fae28f5c21238bf63e48d7aa Mon Sep 17 00:00:00 2001
From: Matt Corallo <git@bluematt.me>
Date: Fri, 29 Oct 2021 18:59:25 +0000
Subject: [PATCH] Support traits with lifetime bounds (which are ignored)

---
 c-bindings-gen/src/main.rs  | 17 +++++++++++------
 c-bindings-gen/src/types.rs | 35 ++++++++++++++++++++---------------
 2 files changed, 31 insertions(+), 21 deletions(-)

diff --git a/c-bindings-gen/src/main.rs b/c-bindings-gen/src/main.rs
index 1976160..9616694 100644
--- a/c-bindings-gen/src/main.rs
+++ b/c-bindings-gen/src/main.rs
@@ -482,13 +482,18 @@ fn writeln_trait<'a, 'b, W: std::io::Write>(w: &mut W, t: &'a syn::ItemTrait, ty
 					&syn::TraitItem::Type(ref t) => {
 						if t.default.is_some() || t.generics.lt_token.is_some() { unimplemented!(); }
 						let mut bounds_iter = t.bounds.iter();
-						match bounds_iter.next().unwrap() {
-							syn::TypeParamBound::Trait(tr) => {
-								writeln!(w, "\ttype {} = crate::{};", t.ident, $type_resolver.resolve_path(&tr.path, Some(&gen_types))).unwrap();
-							},
-							_ => unimplemented!(),
+						loop {
+							match bounds_iter.next().unwrap() {
+								syn::TypeParamBound::Trait(tr) => {
+									writeln!(w, "\ttype {} = crate::{};", t.ident, $type_resolver.resolve_path(&tr.path, Some(&gen_types))).unwrap();
+									for bound in bounds_iter {
+										if let syn::TypeParamBound::Trait(_) = bound { unimplemented!(); }
+									}
+									break;
+								},
+								syn::TypeParamBound::Lifetime(_) => {},
+							}
 						}
-						if bounds_iter.next().is_some() { unimplemented!(); }
 					},
 					_ => unimplemented!(),
 				}
diff --git a/c-bindings-gen/src/types.rs b/c-bindings-gen/src/types.rs
index 498bdf5..357fe4c 100644
--- a/c-bindings-gen/src/types.rs
+++ b/c-bindings-gen/src/types.rs
@@ -294,23 +294,28 @@ impl<'a, 'p: 'a> GenericTypes<'a, 'p> {
 				&syn::TraitItem::Type(ref t) => {
 					if t.default.is_some() || t.generics.lt_token.is_some() { unimplemented!(); }
 					let mut bounds_iter = t.bounds.iter();
-					match bounds_iter.next().unwrap() {
-						syn::TypeParamBound::Trait(tr) => {
-							assert_simple_bound(&tr);
-							if let Some(path) = types.maybe_resolve_path(&tr.path, None) {
-								if types.skip_path(&path) { continue; }
-								// In general we handle Deref<Target=X> as if it were just X (and
-								// implement Deref<Target=Self> for relevant types). We don't
-								// bother to implement it for associated types, however, so we just
-								// ignore such bounds.
-								if path != "std::ops::Deref" && path != "core::ops::Deref" {
-									self.typed_generics.insert(&t.ident, path);
+					loop {
+						match bounds_iter.next().unwrap() {
+							syn::TypeParamBound::Trait(tr) => {
+								assert_simple_bound(&tr);
+								if let Some(path) = types.maybe_resolve_path(&tr.path, None) {
+									if types.skip_path(&path) { continue; }
+									// In general we handle Deref<Target=X> as if it were just X (and
+									// implement Deref<Target=Self> for relevant types). We don't
+									// bother to implement it for associated types, however, so we just
+									// ignore such bounds.
+									if path != "std::ops::Deref" && path != "core::ops::Deref" {
+										self.typed_generics.insert(&t.ident, path);
+									}
+								} else { unimplemented!(); }
+								for bound in bounds_iter {
+									if let syn::TypeParamBound::Trait(_) = bound { unimplemented!(); }
 								}
-							} else { unimplemented!(); }
-						},
-						_ => unimplemented!(),
+								break;
+							},
+							syn::TypeParamBound::Lifetime(_) => {},
+						}
 					}
-					if bounds_iter.next().is_some() { unimplemented!(); }
 				},
 				_ => {},
 			}
-- 
2.39.5