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Add back limitations to more accurately model NLLs

Status: Open.

#253 In rust-lang/a-mir-formality;

· lqd opened on Mar 13, 2026

Left-recursion seed selection can miss valid parses

Status: Open.

#251 In rust-lang/a-mir-formality;

· nikomatsakis opened on Mar 6, 2026

Cleanup: impl Upcast helper for NLL typed place expression construction

enhancementNew feature or requestNew feature or request

good first issueGood for newcomersGood for newcomers

Status: Open.

#250 In rust-lang/a-mir-formality;

· nikomatsakis opened on Mar 5, 2026

Cleanup: NLL mutable stack building pattern

good first issueGood for newcomersGood for newcomers

Status: Open.

#249 In rust-lang/a-mir-formality;

· nikomatsakis opened on Mar 5, 2026

Cleanup: nicer pattern for Arc in #[term] types

good first issueGood for newcomersGood for newcomers

Status: Open.

#248 In rust-lang/a-mir-formality;

· nikomatsakis opened on Mar 5, 2026

Cleanup: change CoreFold output type to support folding reference tuples

good first issueGood for newcomersGood for newcomers

Status: Open.

#247 In rust-lang/a-mir-formality;

· nikomatsakis opened on Mar 5, 2026

closures -- how to model them

good first issueGood for newcomersGood for newcomers

Status: Open.

#236 In rust-lang/a-mir-formality;

· nikomatsakis opened on Jan 14, 2026

opaque types

Status: Open.

#235 In rust-lang/a-mir-formality;

· nikomatsakis opened on Jan 14, 2026

outlives and type-tests

Status: Open.

#234 In rust-lang/a-mir-formality;

· nikomatsakis opened on Jan 14, 2026

higher-ranked where-clauses, outlives

Status: Open.

#233 In rust-lang/a-mir-formality;

· nikomatsakis opened on Jan 14, 2026

"struct" value expression is specific to "structs"

Status: Open.

#231 In rust-lang/a-mir-formality;

· nikomatsakis opened on Jan 14, 2026

cycle detection in borrow check is more precise than real Rust

Status: Open.

#230 In rust-lang/a-mir-formality;

· nikomatsakis opened on Jan 14, 2026