lcnr/random-rust-snippets

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A collection of Rust code snippets which are interesting or weird

Stars: 12
Forks: 0
Open beginner issues: 0
Indexed issues: 31

Dominant language: No language data
License: No license data
Last GitHub push: Apr 25, 2023
Latest indexed: Sep 18, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed
PR merge metrics: No merged PRs in 30d

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31 open issues indexed

method calls on integer inference variables Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

lcnr/random-rust-snippets#32 · Opened Aug 25, 2026
RPIT not in signature or `ParamEnv` Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

lcnr/random-rust-snippets#31 · 1 comment · Opened Aug 3, 2026
`ParamEnv` normalization can fail as it relies on normalizing another where-clause first Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

lcnr/random-rust-snippets#30 · 2 reactions · Opened Jun 1, 2026
`ParamEnv` normalizating can result in incorrectly rigid aliases Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

lcnr/random-rust-snippets#29 · Opened Jun 1, 2026
normalizing impl headers before proving constraining projection where-clauses causes unnecessary errors due to `param_env` preference Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

lcnr/random-rust-snippets#28 · Opened May 26, 2026
unlike closure parent args, we check member constraints for unused early-bound `FnDef` lifetimes Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

lcnr/random-rust-snippets#27 · Opened Apr 10, 2026
`Send` bounds for async closures without upvars on stable Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

lcnr/random-rust-snippets#26 · 3 comments · 1 reaction · Opened Apr 1, 2026
closure signature inference can leak placeholders and fail to infer stuff to be higher ranked Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

lcnr/random-rust-snippets#25 · Opened Feb 26, 2026
closure signature inference makes me sad Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

lcnr/random-rust-snippets#24 · 5 comments · Opened Feb 19, 2026
param-env shadowing can cause goals to fail Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

lcnr/random-rust-snippets#23 · 1 comment · 1 reaction · Opened Dec 3, 2025
borrowck can impact type inference Open

Difficulty 5/5 Over a week Newbie friendliness 28/100

lcnr/random-rust-snippets#22 · 1 comment · 1 reaction · Opened Oct 17, 2025
we don't use item bounds of opaques when resolving associated item Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

lcnr/random-rust-snippets#21 · Opened Sep 22, 2025
method selection considers nested deref steps without applying the constrains from computing them Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

lcnr/random-rust-snippets#20 · 2 comments · Opened Sep 15, 2025
two ways to get RPITs into non-self positions in their item-bounds Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

lcnr/random-rust-snippets#19 · Opened Sep 10, 2025
Rust has only-const callable functions thanks to PMEs Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

lcnr/random-rust-snippets#18 · 1 comment · 2 reactions · Opened Aug 20, 2025
reborrows depend on the current inference state Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

lcnr/random-rust-snippets#17 · 3 reactions · Opened Jul 16, 2025
opaque type universal args cannot depend on member constraints Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

lcnr/random-rust-snippets#16 · Opened Apr 8, 2025
normalization may result in unconstrained regions Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

lcnr/random-rust-snippets#15 · 2 comments · 1 reaction · Opened Jan 30, 2025
downcast for non-`'static` types Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

lcnr/random-rust-snippets#14 · 2 comments · 2 reactions · Opened Jan 7, 2025
auto trait leakage can be used to leak arbitrary types Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

lcnr/random-rust-snippets#13 · 1 comment · 1 reaction · Opened Dec 20, 2024
associated types have to be fully constrained Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

lcnr/random-rust-snippets#12 · Opened Dec 20, 2024
function definitions have variance Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

lcnr/random-rust-snippets#11 · Opened Dec 18, 2024
disjointness based on associated types Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

lcnr/random-rust-snippets#10 · 2 reactions · Opened Oct 22, 2024
builtin-`derive` errors when encountering macros in type position Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

lcnr/random-rust-snippets#9 · Opened Jul 18, 2024
buitlin-`derive` constrains non-qualified paths Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

lcnr/random-rust-snippets#8 · 1 reaction · Opened Jul 18, 2024
`Projection` assumption have stronger requirements than goals Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

lcnr/random-rust-snippets#6 · Opened Apr 23, 2024
disjunction in region bounds Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

lcnr/random-rust-snippets#5 · Opened Sep 4, 2023
array indexing may not move Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

lcnr/random-rust-snippets#4 · 1 comment · Opened Sep 4, 2023
bivariance means that arguments are completely unconstrained Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

lcnr/random-rust-snippets#3 · 3 comments · Opened May 9, 2023
the same projection may use different candidates Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

lcnr/random-rust-snippets#2 · 3 comments · Opened May 2, 2023
transmuting `&dyn Trait` to `&(dyn Trait + Send)` is unsound in general Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

lcnr/random-rust-snippets#1 · Opened Apr 25, 2023

lcnr/random-rust-snippets

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