Doctests can't be triggered for methods of structs with multiple lifetimes

rust-analyzer version: 0.3.2971-standalone (ffcdbbd906 2026-07-13)

rustc version: rustc 1.99.0-nightly (14cae6813 2026-07-08)

editor or extension: VSCode

code snippet to reproduce:

struct Foo<'a, 'b>(&'a (), &'b ());

impl<'a, 'b> Foo<'a, 'b> {
    /// ```
    /// let _ = "Hello, world!";
    /// ```
    fn method(self) {
        unimplemented!()
    }
}

Clicking "Run Doctest" above this doctest gives the following.

 *  Executing task: cargo test --doc --package ra-test -- Foo<'a>::method --nocapture 

    Finished `test` profile [unoptimized + debuginfo] target(s) in 0.00s
   Doc-tests ra_test

running 0 tests

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 1 filtered out; finished in 0.00s

all doctests ran in 0.36s; merged doctests compilation took 0.13s
 *  Terminal will be reused by tasks, press any key to close it. 

The parameter 'b is missing from the generated command's filter, and so the command fails to find the right test.

Similar to https://github.com/rust-lang/rust-analyzer/issues/14142, which is fixed in https://github.com/rust-lang/rust-analyzer/pull/14185.

Start by reproducing the issue from the provided Rust struct and impl snippet, then inspect the Run Doctest entry point and the generated cargo test --doc filter shown in the report. The fix is done when methods on structs with multiple lifetimes produce a filter containing both lifetime parameters and the doctest runs instead of reporting zero tests.