rust: Add type annotation to fix inference on Rust Nightly
authorSimon Sapin <simon.sapin@octobus.net>
Wed, 19 May 2021 15:08:27 +0200
changeset 47298 402bd66cbdf2
parent 47297 18415fc918a1
child 47299 16b48ebf656e
rust: Add type annotation to fix inference on Rust Nightly When compiling with Rust Nightly, the im-rs crate silently makes use of the experimental language feature for trait impl specialization. This apperently changes public its APIs in subtle ways such that type inference of some user code can fail where it succeeds when specialization is disabled. This made Mercurial’s Rust unit tests have compilation errors on Nightly. I have not managed to find the exactl root cause, but I wrote down my findings so far at https://github.com/bodil/im-rs/issues/188 This adds type annotation to make unit tests rely less on type inference and work around the issue. Differential Revision: https://phab.mercurial-scm.org/D10742
rust/hg-core/src/copy_tracing/tests_support.rs
--- a/rust/hg-core/src/copy_tracing/tests_support.rs	Wed May 19 13:45:34 2021 +0200
+++ b/rust/hg-core/src/copy_tracing/tests_support.rs	Wed May 19 15:08:27 2021 +0200
@@ -123,7 +123,10 @@
                     ),
                 )
             })
-            .collect::<OrdMap<_, _>>()
+            .collect::<OrdMap<
+                String,
+                (Revision, Option<String>, OrdSet<Revision>)
+            >>()
         }
     };
 }