Change opt-level from 3 to 2 for the test profile.

Signed-off-by: Daira-Emma Hopwood <[email protected]>

Cargo.toml

@@ -164,19 +164,19 @@ codegen-units = 1
 
 [profile.test]
 # Since we have many computationally expensive tests, this changes the test profile to
-# compile with optimizations by default, but keep full debug info.
+# compile with `opt-level = 2` by default, but keep full debug info.
 #
 # This differs from the release profile in the following ways:
-# - it does not set `lto = true`, which increases compile times without substantially
+# - it does not set `lto = true`, which would increase compile times without substantially
 #   speeding up tests;
-# - it does not set `codegen-units = 1`, which increases compile times and is only
+# - it does not set `codegen-units = 1`, which would increase compile times and is only
 #   useful to improve determinism of release builds;
 # - it does not set `panic = 'abort'`, which is in any case ignored for tests.
 #
 # To get results as close as possible to a release build, use `cargo test --release`.
 # To speed up compilation and avoid optimizations potentially resulting in lower-quality
 # debug info, use `cargo test --profile=dev`.
-opt-level = 3
+opt-level = 2
 debug = true
 
 [workspace.lints.rust]