Take parameters to trait functions as mut

In keeping with "generally, make all variables mut so that
converters can assume inputs are mut", we should do the same for
trait implementation blocks.

diff --git a/c-bindings-gen/src/main.rs b/c-bindings-gen/src/main.rs
index 918a05a935e0c117d93f3dddfcb92365a178a78a..fe3746c041bcd247c7c5b9de96140af462b4a250 100644 (file)
--- a/c-bindings-gen/src/main.rs
+++ b/c-bindings-gen/src/main.rs
@@ -388,7 +388,7 @@ fn writeln_trait<'a, 'b, W: std::io::Write>(w: &mut W, t: &'a syn::ItemTrait, ty
                                                                                                        ident.mutability.is_some() || ident.subpat.is_some() {
                                                                                                unimplemented!();
                                                                                        }
-                                                                                       write!(w, ", {}{}: ", if $type_resolver.skip_arg(&*arg.ty, Some(&meth_gen_types)) { "_" } else { "" }, ident.ident).unwrap();
+                                                                                       write!(w, ", mut {}{}: ", if $type_resolver.skip_arg(&*arg.ty, Some(&meth_gen_types)) { "_" } else { "" }, ident.ident).unwrap();
                                                                                }
                                                                                _ => unimplemented!(),
                                                                        }