bors fa883cb647 Auto merge of #12834 - fasterthanlime:proc-macro-test-toolchain, r=Veykril ... Add PROC_MACRO_TEST_TOOLCHAIN environment variable This allows overriding the toolchain used to run `proc-macro-srv` tests. --- Sample usage. Testing the current ABI (variable unset/empty): ```shell amos@tails ~/bearcove/rust-analyzer/crates/proc-macro-srv proc-macro-test-toolchain* ❯ PROC_MACRO_TEST_TOOLCHAIN="" cargo test --quiet running 16 tests ................ test result: ok. 16 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s ``` Testing an older ABI: ```shell amos@tails ~/bearcove/rust-analyzer/crates/proc-macro-srv proc-macro-test-toolchain* ❯ PROC_MACRO_TEST_TOOLCHAIN="1.58" cargo test --quiet running 16 tests ................ test result: ok. 16 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s ``` Testing current nightly ABI: ```shell ❯ rustc +nightly --version rustc 1.64.0-nightly (f8588549c 2022-07-18) ❯ PROC_MACRO_TEST_TOOLCHAIN="nightly" cargo test --quiet running 16 tests ................ test result: ok. 16 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s ``` Testing future ABI (`rust-lang/rust` master): ```shell amos@tails ~/bearcove/rust-analyzer/crates/proc-macro-srv proc-macro-test-toolchain ❯ PROC_MACRO_TEST_TOOLCHAIN="stage1" cargo test --quiet running 16 tests ..........thread '<unnamed>' panicked at 'range end index 216221164920373249 out of range for slice of length 18', library/core/src/slice/index.rs:73:5 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace ....F. failures: ---- tests::test_fn_like_macro2 stdout ---- thread 'tests::test_fn_like_macro2' panicked at 'called `Result::unwrap()` on an `Err` value: "range end index 216221164920373249 out of range for slice of length 18"', crates/proc-macro-srv/src/tests/utils.rs:38:83 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace failures: tests::test_fn_like_macro2 test result: FAILED. 15 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s error: test failed, to rerun pass '--lib ``` --- Tagging `@jonas-schievink:` this might be helpful when updating versioned ABIs later on.		2022-07-20 16:04:23 +00:00
..
imp	Add proc-macro-srv integration test that clones literals	2022-07-20 16:43:40 +02:00
src	Enable extra warnings required by rust-lang/rust	2022-07-20 15:00:17 +02:00
build.rs	Add PROC_MACRO_TEST_TOOLCHAIN environment variable	2022-07-20 17:43:45 +02:00
Cargo.toml	Bump cargo_metadata	2022-07-03 10:09:35 +03:00