Allow ?Sized bounds in some cases

Author: TheBlueMatt

c-bindings-gen/src/main.rs

@@ -532,7 +532,12 @@ fn writeln_trait<'a, 'b, W: std::io::Write>(w: &mut W, t: &'a syn::ItemTrait, ty
 								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 { panic!("11"); }
+										if let syn::TypeParamBound::Trait(t) = bound {
+											// We only allow for `?Sized` here.
+											if let syn::TraitBoundModifier::Maybe(_) = t.modifier {} else { panic!(); }
+											assert_eq!(t.path.segments.len(), 1);
+											assert_eq!(format!("{}", t.path.segments[0].ident), "Sized");
+										}
 									}
 									break;
 								},

c-bindings-gen/src/types.rs

@@ -215,7 +215,7 @@ impl<'a, 'p: 'a> GenericTypes<'a, 'p> {
 					'bound_loop: for bound in type_param.bounds.iter() {
 						if let syn::TypeParamBound::Trait(trait_bound) = bound {
 							if let Some(ident) = single_ident_generic_path_to_ident(&trait_bound.path) {
-								match &format!("{}", ident) as &str { "Send" => continue, "Sync" => continue, _ => {} }
+								match &format!("{}", ident) as &str { "Send" => continue, "Sync" => continue, "Sized" => continue, _ => {} }
 							}
 							if path_matches_nongeneric(&trait_bound.path, &["core", "clone", "Clone"]) { continue; }
 
@@ -352,7 +352,12 @@ impl<'a, 'p: 'a> GenericTypes<'a, 'p> {
 									}
 								} else { unimplemented!(); }
 								for bound in bounds_iter {
-									if let syn::TypeParamBound::Trait(_) = bound { unimplemented!(); }
+									if let syn::TypeParamBound::Trait(t) = bound {
+										// We only allow for `?Sized` here.
+										if let syn::TraitBoundModifier::Maybe(_) = t.modifier {} else { panic!(); }
+										assert_eq!(t.path.segments.len(), 1);
+										assert_eq!(format!("{}", t.path.segments[0].ident), "Sized");
+									}
 								}
 								break;
 							},