Skip to content

de-RFC: Remove unsized_locals #3829

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 12 commits into
base: master
Choose a base branch
from
+169 −0
Open

de-RFC: Remove unsized_locals #3829

Changes from 1 commit
Commits
Show all changes
12 commits
Select commit Hold shift + click to select a range
f951ce6
de-RFC: Remove unsized_locals
Noratrieb Jun 2, 2025
9347bb5
Typos
Noratrieb Jun 2, 2025
b48b123
unsized_fn_params
Noratrieb Jun 4, 2025
abb5788
talk about recursion
Noratrieb Jun 4, 2025
a104109
move
Noratrieb Jun 4, 2025
5bc1184
link MIR semantics
Noratrieb Jun 4, 2025
0e0b1a5
unaccept 1909
Noratrieb Jun 4, 2025
969b139
Linus
Noratrieb Jun 4, 2025
571ff4d
typo
Noratrieb Jun 4, 2025
7a8424e
Update text/1909-unsized-rvalues.md
Noratrieb Jun 4, 2025
c0c6b67
Update text/3829-de-rfc-unsized-locals.md
Noratrieb Jun 4, 2025
cff645d
Be explicit that this does not close the door
Noratrieb Aug 20, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
5 changes: 5 additions & 0 deletions text/3829-de-rfc-unsized-locals.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -94,6 +94,10 @@ The `unsized_locals` feature is removed from the compiler and [RFC 1909] is offi

If someone wants to bring dynamic stack allocation into Rust again, a new design will have to be designed from scratch, considering all the problems laid out in this RFC.

This does not have a negative effect on features that feature unsized values in function signatures like `unsized_fn_params`.
Their behavior is much more clear and they are implemented differently.
In fact, `unsized_fn_params` is currently needed in the standard library to implement `Box<dyn FnOnce()> as FnOnce()>`.

# Drawforwards
[drawforwards]: #drawforwards

Expand Down Expand Up @@ -130,6 +134,7 @@ The best prior art for this removal is of course the inspiration for the de-RFC
# Unresolved answers
[unresolved-answers]: #unresolved-answers


None

# Future probabilities
Expand Down