nits

src/core/editor/Modify.re

@@ -139,10 +139,10 @@ let rec remold = (~fill=Cell.dirty, ctx: Ctx.t): (Cell.t, Ctx.t) => {
               (),
             );
           // hack(?) to avoid completion if no new ghosts are generated. if only
-          // grout are generated, then we can generated them later at the end of
-          // remolding. better to delay their generation bc there may be grout in
-          // the suffix whose relative position around neighboring whitespace we
-          // want to preserve.
+          // grout are generated, then we can generate them later as needed at the
+          // end of remolding. better to delay their generation bc there may already
+          // be grout in the suffix whose relative position around neighboring
+          // whitespace we want to preserve.
           effs
           |> List.for_all(
                fun

src/core/editor/Zipper.re

@@ -192,7 +192,13 @@ and unzip_select = (~ctx=Ctx.empty, sel: Path.Selection.t, meld: Meld.t) => {
 };
 
 let unzip_exn = (~ctx=Ctx.empty, c: Cell.t) =>
-  unzip(~ctx, c) |> Options.get_exn(Invalid_argument("Zipper.unzip_exn"));
+  switch (unzip(~ctx, c)) {
+  | Some(z) => z
+  | None =>
+    P.show("unzip_exn ctx", Ctx.show(ctx));
+    P.show("unzip_exn cell", Cell.show(c));
+    raise(Invalid_argument("Zipper.unzip_exn"));
+  };
 
 let rec zip_neighbor = (~side: Dir.t, ~zipped: Cell.t, ctx: Ctx.t) => {
   open Options.Syntax;