Rust nightly, try_blocks feature.

[deuszx]

Currently, it's forced upon users of OpenBrush to use nightly Rust - due to OB usage of min_specialization features. There's an effort to remove that which would then allow dependent projects to compile with Rust stable.

This project won't be able to due to its usage of [feature(try_blocks)]. If not completely necessary - I would recommend to remove it.