buildRustPackage: use checkType argument

The `checkType` argument of buildRustPackage was not used anymore
since the refactoring of `buildRustPackage` into hooks. This was
an oversight that is fixed by this change.

The check type can also be passed directly to cargoCheckHook using the
`cargoCheckType` environment variable.

doc/languages-frameworks/rust.section.md

@@ -320,9 +320,10 @@ attributes can also be used:
  variable `buildAndTestSubdir` can be used to build a crate in a
  Cargo workspace. Additional maturin flags can be passed through
  `maturinBuildFlags`.
-* `cargoCheckHook`: run tests using Cargo. Additional flags can be
- passed to Cargo using `checkFlags` and `checkFlagsArray`. By
- default, tests are run in parallel. This can be disabled by setting
+* `cargoCheckHook`: run tests using Cargo. The build type for checks
+ can be set using `cargoCheckType`. Additional flags can be passed to
+ the tests using `checkFlags` and `checkFlagsArray`. By default,
+ tests are run in parallel. This can be disabled by setting
  `dontUseCargoParallelTests`.
 * `cargoInstallHook`: install binaries and static/shared libraries
  that were built using `cargoBuildHook`.

pkgs/build-support/rust/default.nix

@@ -103,6 +103,8 @@ stdenv.mkDerivation ((removeAttrs args ["depsExtraArgs"]) // lib.optionalAttrs u
 
  cargoBuildType = buildType;
 
+ cargoCheckType = checkType;
+
  patchRegistryDeps = ./patch-registry-deps;
 
  nativeBuildInputs = nativeBuildInputs ++ [

pkgs/build-support/rust/hooks/cargo-check-hook.sh

@@ -15,7 +15,7 @@ cargoCheckHook() {
  threads=1
  fi
 
- argstr="--${cargoBuildType} --target @rustTargetPlatformSpec@ --frozen";
+ argstr="--${cargoCheckType} --target @rustTargetPlatformSpec@ --frozen";
 
  (
  set -x