🐛 Hangs on patch

[mustafa0x]

delta (v0.16.5) hangs on the following input (save as bad-diff.diff and run delta < bad-diff.diff)

commit deadbeef

diff --git a/bar.svelte b/bar.svelte
--- a/bar.svelte
+++ b/bar.svelte
@@ -90,7 +90,9 @@ async function add(a, b) {
+let foo
 export async function go_to_bar(bar_no) {
+    foo = bar_no
     /*

Happened when running git log -p | delta, and I narrowed it down to this.

[dandavison]

Hi @mustafa0x, thanks! That's exciting. It appears to be the syntax highlighting library (syntect), or something about the way that delta's calling syntect.

A print statement before this line https://github.com/dandavison/delta/blob/master/src/paint.rs#L669

shows that delta is submitting the line below to syntect highlight_line and that this call hangs.

     /*

[dandavison]

Looks like trishume/syntect#460.

[dandavison]

We may want to follow what was done here: rust-lang/docs.rs#1944