Clarify a comment.

nnethercote · nnethercote · commit 9a785e0aa546 · 2022-05-27T15:58:35.000+10:00
`reverse_encode` isn't necessary to please the borrow checker, it's to
match the ordering done by `reverse_decode`.
diff --git a/library/proc_macro/src/bridge/mod.rs b/library/proc_macro/src/bridge/mod.rs
@@ -176,7 +176,7 @@ macro_rules! with_api {
 }
 
 // FIXME(eddyb) this calls `encode` for each argument, but in reverse,
-// to avoid borrow conflicts from borrows started by `&mut` arguments.
+// to match the ordering in `reverse_decode`.
 macro_rules! reverse_encode {
     ($writer:ident;) => {};
     ($writer:ident; $first:ident $(, $rest:ident)*) => {

Original file line number	Diff line number	Diff line change
`@@ -176,7 +176,7 @@ macro_rules! with_api {`
`176`	`176`	`}`
`177`	`177`
`178`	`178`	// FIXME(eddyb) this calls `encode` for each argument, but in reverse,
`179`		-// to avoid borrow conflicts from borrows started by `&mut` arguments.
	`179`	+// to match the ordering in `reverse_decode`.
`180`	`180`	`macro_rules! reverse_encode {`
`181`	`181`	`($writer:ident;) => {};`
`182`	`182`	`($writer:ident; $first:ident $(, $rest:ident)*) => {`