I think the main issue is insufficient attention and testing which most Nightly features get nowadays. This is one of the reasons why I've proposed semi-stabilization (a.k.a beta-features):
Related topics
Topic | Replies | Views | Activity | |
---|---|---|---|---|
Concerned about Rust 2018 stability
|
17 | 4722 | March 25, 2019 | |
Idea: Semi-stabilization | 37 | 4532 | July 7, 2019 | |
1.27.1 prerelease testing | 6 | 1282 | March 25, 2019 | |
Announcing State Of Rust | 9 | 8757 | March 25, 2019 | |
Possible stabilizations for 2018 Edition Preview 2 | 9 | 5668 | March 25, 2019 |