Empty ```TupleStructPattern``` assumed to be function call
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bug
- Dominant language
- C++
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Description
I tried this code:
struct S();
pub fn main() {
match S() {
S() => {}
}
}
I expected to see this happen: no error
Instead, this happened:
<source>:5:9: error: expected tuple struct or tuple variant, found associated function [E0164]
5 | S() => {}
| ^
| function calls are not allowed in patterns
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
Start by compiling the Rust snippet in the issue and tracing how the compiler handles the empty S() pattern in a match. Done means the example compiles without the E0164 diagnostic and preserves the expected pattern-matching behavior.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp, rust
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 42/100