rust-lang / rust-lang/rust-bindgen
Renaming a `using` defined template type lose generic definition
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A-C++
A-templates
bug
- Dominant language
- Rust
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Description
Input C/C++ Header
template <typename T, int N>
using array_field = T[N];
template <typename T, int N>
using renamed = array_field<T, N>;
Bindgen Invocation
$ bindgen array.hh -- -std=c++17
Actual Results
/* automatically generated by rust-bindgen 0.57.0 */
pub type array_field<T> = *mut T;
pub type renamed = array_field<T>;
Expected Results
/* automatically generated by rust-bindgen 0.57.0 */
pub type array_field<T> = *mut T;
pub type renamed<T> = array_field<T>;
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Reproduce the issue with the shown C++ aliases in array.hh and the bindgen command using -std=c++17. Trace how bindgen emits generic aliases, then compare the generated output with the expected generic renamed alias. Done when renamed retains its T parameter and the regression is covered by a test.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp, rust
- Domain
- devtools
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Clearly specified
- Newbie friendliness
- 45/100