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Support impl Trait in a parameter position #4540

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jfecher opened this issue Mar 12, 2024 · 1 comment · Fixed by #4919
Closed

Support impl Trait in a parameter position #4540

jfecher opened this issue Mar 12, 2024 · 1 comment · Fixed by #4919
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@michaeljklein
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enhancement New feature or request

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@jfecher
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jfecher commented Mar 12, 2024

Problem

Noir already has limited support for impl Trait in a return type position. It should also support impl Trait in a parameter position for consistency.

Happy Case

impl Trait in a parameter position is added.

This is just sugar for a trait constraint on a generic parameter:

fn foo(x: impl Bar) {}

// same as
fn foo<T>(x: T) where T: Bar {}

Project Impact

None

Impact Context

No response

Workaround

None

Workaround Description

No response

Additional Context

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Would you like to submit a PR for this Issue?

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@jfecher jfecher added the enhancement New feature or request label Mar 12, 2024
@jfecher jfecher mentioned this issue Mar 12, 2024
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@michaeljklein michaeljklein mentioned this issue Mar 20, 2024
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@michaeljklein
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Duplicate of #3771

See there for implementation notes

@jfecher jfecher mentioned this issue Apr 4, 2024
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@michaeljklein michaeljklein mentioned this issue Apr 25, 2024
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github-merge-queue bot pushed a commit that referenced this issue Apr 29, 2024
@michaeljklein
feat: add de-sugaring for impl Trait in function parameters (#4919)
8aad2e4 
# Description

## Problem\*

Resolves #4540

## Summary\*

In the resolver, when `x: impl Trait` is encountered as a function
parameter,
it is desugared to:
```rust
fn function_name<T_impl_trait>(x: T_impl_trait) where T_impl_trait: Trait
```

## Additional Context

In the current iteration of this PR, `T[func_id]_impl_[trait_name]` is
checked for collisions and
incremented (`T[func_id]_impl_[trait_name]_N`) until there's no
collision.

Note that this PR adds a few ~unrelated cases where `TraitAsType` could
have arguments that were previously skipped:

https://github.com/noir-lang/noir/pull/4919/files#diff-52c7ae61478bab09a4d23320128eead3a88cde6a7be16fb8b070b5512d690bbdR1203

## Documentation\*

Check one:
- [ ] No documentation needed.
- [ ] Documentation included in this PR.
- [ ] **[For Experimental Features]** Documentation to be submitted in a
separate PR.

# PR Checklist\*

- [x] I have tested the changes locally.
- [x] I have formatted the changes with [Prettier](https://prettier.io/)
and/or `cargo fmt` on default settings.
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@michaeljklein michaeljklein

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enhancement New feature or request
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feat: add de-sugaring for impl Trait in function parameters noir-lang/noir
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@michaeljklein @jfecher