Default type parameters are not in the language reference

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
68/100
Issue type
Documentation
Clarity
Mostly clear
Activity status
Quiet
Tech stack
rust
Domain
documentation

Research direction

Start with the language reference's Type Parameters section linked in the issue, then read the linked discussion about default type parameters and inference. The work is done when the reference documents the default type parameter syntax and explains its interaction with inference.

Written by the indexing model from the issue text.

Description

A-generics A-types New Content

Migrated from https://github.com/rust-lang/rust/issues/38011

Default type parameters (e g struct Foo<A = u32>(A)) is a language feature, but they are not mentioned in the language reference.

It would be nice if such a reference also mentioned the tricky semantics around how it interacts with inference, as mentioned here.

Dominant language
Rust
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Merged PRs (30d)
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