Commits on Jan 7, 2020

1. buildRustCrate: add buildTests flag to tell rustc to build tests in… …

   …stead of binaries
   
   This helps us instruct rustc to build tests instead of binaries. The
   actual build will then ONLY produce test executables. This is a first
   step towards having rust crate tests within nixpkgs.
   
   We default back to only a single output in test cases since that is the
   only reasonable thing to do here.
   
   Producing libraries or binaries in addition to tests would theoretically
   be feasible but usually generates different dependency trees. It is very
   common to have some libraries in `[dev-depdendencies]` within Cargo.toml
   just for your tests. To not start mixing things up going with a
   dedicated derivation for the test build sounds like the best choice for
   now.
   
   To use this you must provide a proper test dependency chain to
   `buildRustCrate` (as you would usually do with your non-test inputs).
   And then set the `buildTests` attribute to `true`. The derivation will
   then contain all tests that were built in `$out/tests`. All common test
   patterns and directories should be supported and tested by this change.
   
   Below is an example how you would run a single test from the derivation.
   This commit contains some more examples in the `buildRustCrateTests`
   attribute set that might be helpful.
   
   ```
   let
     drv = buildRustCrate {
        …
        buildTests true;
     };
   in runCommand "test-my-crate" {} ''
     touch $out
     exec ${drv}/tests/my-test
   ''
   ```

   

   andir committed Jan 7, 2020
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2. buildRustCrate: slight "rewording" and reformatting …

   There is no point in reinventinb builtins through `filterAttrs` or the
   like. Lets just stick to what we already have in our toolbelt.

   

   andir committed Jan 7, 2020
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3. CODEOWNERS: add myself to pkgs/build-support/rust

   

   andir committed Jan 7, 2020
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