format migrate leads to error: invalid try target

[Anton-4]

basic-webserver on  HEAD (db94e89) via 🦀 v1.79.0
❯ cat platform/Path.roc | rg read_err
        |> Result.mapErr? \read_err -> FileReadErr path (InternalIOErr.handle_err read_err)

basic-webserver on  HEAD (db94e89) via 🦀 v1.79.0
❯ roc format --migrate platform/Path.roc

basic-webserver on  HEAD (db94e89) [!] via 🦀 v1.79.0
❯ cat platform/Path.roc | rg read_err
        |> Result.map_err?(|read_err| FileReadErr(path, InternalIOErr.handle_err(read_err)))

basic-webserver on  HEAD (db94e89) [!] via 🦀 v1.79.0
❯ roc version
roc built from commit 0e35e33f85, committed at 2025-01-28 09:57:55 UTC

Error:

+ roc check ./examples/dir.roc

── INVALID TRY TARGET in ./examples/../platform/Path.roc ───────────────────────

This expression cannot be tried with the ? operator:

310│          |> Result.map_err?(|read_err| FileReadErr(path, InternalIOErr.handle_err(read_err)))
                 ^^^^^^^^^^^^^^

I expected a Result, but it actually has type:

    Result ok a, (a -> b) -> Result ok b

Hint: Did you forget to wrap the value with an Ok or an Err tag?

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1 error and 0 warnings found in 25 ms.