The `Iterator::all` method consumes the input iterator `f` so when
we reuse `f` in `f.flatten().collect()` it yields an empty Vector
in the case where all the elements are successfully converted using
try_into(). This causes out of bounds access when indexing into
the resulting Vector to extract the individual components.
Fixes#32570.
Signed-off-by: Mukilan Thiyagarajan <mukilan@igalia.com>
This does not (yet) upgrade ./rust-toolchain
The warnings:
* dead_code "field is never read"
* redundant_semicolons "unnecessary trailing semicolon"
* non_fmt_panic "panic message is not a string literal, this is no longer accepted in Rust 2021"
* unstable_name_collisions "a method with this name may be added to the standard library in the future"
* legacy_derive_helpers "derive helper attribute is used before it is introduced" https://github.com/rust-lang/rust/issues/79202
