Bazel toolchain support

This adds the Bazel toolchain support to change the effective Jsonnet compiler. Go-Jsonnet, Jsonnet (cpp) and Jrsonnet (Rust) are implemented. There are some incompatibilities: - Jsonnet (cpp) does not support the -c flag to create nested output directories. - Jrsonnet (Rust) does not support manifest files containing the files that were generated by the Jsonnet program. It's currently only able to write those outputs to stdout. - Jrsonnet text output (e.g. errors) is different compared to the cpp and Go implementations. Due to these incompatibilities there are two addditional attributes on the toolchain: the flags to pass during directory creation and if manifest files are supported. When adding rules_jsonnet as a bzlmod module, a user can now select the preferred compiler by using: ``` jsonnet = use_extension("@rules_jsonnet//jsonnet:extensions.bzl", "jsonnet") jsonnet.compiler(name = "rust") ``` Currently there are three options: `cpp`, `go` and `rust`. Additionally, this fixes CI: The current .bazelci expects a variable ${{ jsonnet_port }} to be defined. However, that isn't the case with the current setup. The current behaviour is an empty ${{ jsonnet_port }} which causes the implementation to fall back to the default (Go), effectively disabling the cpp tests. The CI runs: ``` bazel test //... --extra_toolchains=@rules_jsonnet//jsonnet:go_jsonnet_toolchain bazel test //... --extra_toolchains=@rules_jsonnet//jsonnet:rust_jsonnet_toolchain bazel test //... --extra_toolchains=@rules_jsonnet//jsonnet:cpp_jsonnet_toolchain ``` Lastly, fix docs: The current docs setup only supports a single source file for docs generation (jsonnet.bzl). Now that `toolchains.bzl` is also a file that must be included in the docs generation, we use a helper file `docs.bzl` to aggregate what needs to be documented.
bazel-contrib · Apr 13, 2024 · 2b58194 · 2b58194
1 parent ee776a7
commit 2b58194
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diff --git a/.bazelci/presubmit.yml b/.bazelci/presubmit.yml
@@ -3,6 +3,10 @@ matrix:
   platform:
   - ubuntu2204
   - macos
+  toolchain:
+  - "@rules_jsonnet//jsonnet:go_jsonnet_toolchain"
+  - "@rules_jsonnet//jsonnet:cpp_jsonnet_toolchain"
+  - "@rules_jsonnet//jsonnet:rust_jsonnet_toolchain"
 
 tasks:
   rules_jsonnet:
@@ -16,8 +20,7 @@ tasks:
     platform: ${{ platform }}
     working_directory: docs
     test_flags:
-    - --define
-    - jsonnet_port=${{ jsonnet_port }}
+    - "--extra_toolchains=${{ toolchain }}"
     test_targets:
     - //...
 
@@ -26,7 +29,6 @@ tasks:
     platform: ${{ platform }}
     working_directory: examples
     test_flags:
-    - --define
-    - jsonnet_port=${{ jsonnet_port }}
+    - "--extra_toolchains=${{ toolchain }}"
     test_targets:
     - //...
diff --git a/.github/workflows/create_archive_and_notes.sh b/.github/workflows/create_archive_and_notes.sh
@@ -58,5 +58,7 @@ jsonnet_go_repositories()
 load("@google_jsonnet_go//bazel:deps.bzl", "jsonnet_go_dependencies")
 
 jsonnet_go_dependencies()
+
+register_toolchains("@io_bazel_rules_jsonnet//jsonnet:go_jsonnet_toolchain")
 \`\`\`
 EOF
diff --git a/MODULE.bazel b/MODULE.bazel
@@ -7,3 +7,38 @@ module(
 bazel_dep(name = "bazel_skylib", version = "1.5.0")
 bazel_dep(name = "jsonnet", version = "0.20.0")
 bazel_dep(name = "jsonnet_go", version = "0.20.0", repo_name = "google_jsonnet_go")
+
+bazel_dep(name = "rules_rust", version = "0.41.1")
+
+jsonnet = use_extension("//jsonnet:extensions.bzl", "jsonnet")
+use_repo(jsonnet, "rules_jsonnet_toolchain")
+register_toolchains("@rules_jsonnet_toolchain//:toolchain")
+
+rust = use_extension("@rules_rust//rust:extensions.bzl", "rust")
+rust.toolchain(
+    edition = "2021",
+    # Nightly version is required to be able to depend on a binary dependency
+    # with Cargo.
+    # See https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#artifact-dependencies.
+    versions = ["nightly/2024-04-05"],
+)
+
+use_repo(rust, "rust_toolchains")
+register_toolchains("@rust_toolchains//:all")
+
+crate = use_extension("@rules_rust//crate_universe:extension.bzl", "crate")
+crate.spec(
+    package = "jrsonnet",
+    version = "0.5.0-pre95",
+    # Binary artifacts can't be depended upon without specifically marking the
+    # artifact as `bin`.
+    artifact = "bin",
+)
+
+# Required for rules_rust to generate binary targets for the Jrsonnet crate.
+crate.annotation(
+    crate = "jrsonnet",
+    gen_binaries = ["jrsonnet"],
+)
+crate.from_specs()
+use_repo(crate, "crates")
diff --git a/README.md b/README.md
@@ -22,17 +22,40 @@ These are build rules for working with [Jsonnet][jsonnet] files with Bazel.
 To use the Jsonnet rules as part of your Bazel project, please follow the
 instructions on [the releases page](https://github.com/bazelbuild/rules_jsonnet/releases).
 
-## Jsonnet Port Selection
+## Jsonnet Compiler Selection
 
-By default, Bazel will use [the Go port](https://github.com/google/go-jsonnet) of Jsonnet. To use [the C++ port](https://github.com/google/jsonnet) of Jsonnet instead, invoke Bazel with the `--define jsonnet_port=cpp` command-line flag. To select the Go port explicitly, invoke Bazel with the `--define jsonnet_port=go` command-line flag.
+By default for Bzlmod, Bazel will use the [Go
+compiler](https://github.com/google/go-jsonnet). Note that the
+primary development focus of the Jsonnet project is now with the Go compiler.
+This repository's support for using the C++ compiler is deprecated, and may be
+removed in a future release.
 
-_bazel_ Flag | Jsonnet Port
------------- | ------------
-(none)                     | Go
-`--define jsonnet_port=cpp`| C++
-`--define jsonnet_port=go` | Go
+To use [the
+C++](https://github.com/google/jsonnet) or
+[Rust](https://github.com/CertainLach/jrsonnet) compiler of Jsonnet instead,
+register a different compiler:
 
-Note that the primary development focus of the Jsonnet project is now with the Go port. This repository's support for using the C++ port is deprecated, and may be removed in a future release.
+| Jsonnet compiler | MODULE.bazel directive            | WORKSPACE directive                                                              |
+| ---------------- | --------------------------------- | -------------------------------------------------------------------------------- |
+| Go               | `jsonnet.compiler(name = "go")`   | `register_toolchains("@io_bazel_rules_jsonnet//jsonnet:go_jsonnet_toolchain")`   |
+| cpp              | `jsonnet.compiler(name = "cpp")`  | `register_toolchains("@io_bazel_rules_jsonnet//jsonnet:cpp_jsonnet_toolchain")`  |
+| Rust             | `jsonnet.compiler(name = "rust")` | `register_toolchains("@io_bazel_rules_jsonnet//jsonnet:rust_jsonnet_toolchain")` |
+
+Note that `WORKSPACE` users must register a toolchain manually, using the table
+above as reference.
+
+### CLI
+
+Use the `--extra_toolchains` flag to pass the preferred toolchain to the bazel
+invocation:
+
+```bash
+bazel build //... --extra_toolchains=@rules_jsonnet//jsonnet:cpp_jsonnet_toolchain
+
+bazel test //... --extra_toolchains=@rules_jsonnet//jsonnet:rust_jsonnet_toolchain
+
+bazel run //... --extra_toolchains=@rules_jsonnet//jsonnet:go_jsonnet_toolchain
+```
 
 <a name="#jsonnet_library"></a>
 ## jsonnet_library

diff --git a/docs/BUILD.bazel b/docs/BUILD.bazel
@@ -2,7 +2,7 @@ load("@aspect_bazel_lib//lib:docs.bzl", "stardoc_with_diff_test", "update_docs")
 
 stardoc_with_diff_test(
     name = "jsonnet",
-    bzl_library_target = "@rules_jsonnet//jsonnet:jsonnet",
+    bzl_library_target = "@rules_jsonnet//jsonnet:docs",
 )
 
 update_docs(

diff --git a/docs/MODULE.bazel b/docs/MODULE.bazel
@@ -11,3 +11,17 @@ local_path_override(
     module_name = "rules_jsonnet",
     path = "..",
 )
+
+bazel_dep(name = "rules_rust", version = "0.41.1")
+
+rust = use_extension("@rules_rust//rust:extensions.bzl", "rust")
+rust.toolchain(
+    edition = "2021",
+    # Nightly version is required to be able to depend on a binary dependency
+    # with Cargo.
+    # See https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#artifact-dependencies.
+    versions = ["nightly/2024-04-05"],
+)
+
+use_repo(rust, "rust_toolchains")
+register_toolchains("@rust_toolchains//:all")
diff --git a/docs/jsonnet.md b/docs/jsonnet.md
@@ -1,6 +1,6 @@
 <!-- Generated with Stardoc: http://skydoc.bazel.build -->
 
-Jsonnet Rules
+# Jsonnet Rules
 
 These are build rules for working with [Jsonnet][jsonnet] files with Bazel.
 
@@ -16,7 +16,7 @@ instructions on [the releases page](https://github.com/bazelbuild/rules_jsonnet/
 ## jsonnet_library
 
 <pre>
-jsonnet_library(<a href="#jsonnet_library-name">name</a>, <a href="#jsonnet_library-deps">deps</a>, <a href="#jsonnet_library-srcs">srcs</a>, <a href="#jsonnet_library-data">data</a>, <a href="#jsonnet_library-imports">imports</a>, <a href="#jsonnet_library-jsonnet">jsonnet</a>)
+jsonnet_library(<a href="#jsonnet_library-name">name</a>, <a href="#jsonnet_library-deps">deps</a>, <a href="#jsonnet_library-srcs">srcs</a>, <a href="#jsonnet_library-data">data</a>, <a href="#jsonnet_library-imports">imports</a>)
 </pre>
 
 Creates a logical set of Jsonnet files.
@@ -60,7 +60,6 @@ Example:
 | <a id="jsonnet_library-srcs"></a>srcs |  List of `.jsonnet` files that comprises this Jsonnet library   | <a href="https://bazel.build/concepts/labels">List of labels</a> | optional |  `[]`  |
 | <a id="jsonnet_library-data"></a>data |  -   | <a href="https://bazel.build/concepts/labels">List of labels</a> | optional |  `[]`  |
 | <a id="jsonnet_library-imports"></a>imports |  List of import `-J` flags to be passed to the `jsonnet` compiler.   | List of strings | optional |  `[]`  |
-| <a id="jsonnet_library-jsonnet"></a>jsonnet |  A jsonnet binary   | <a href="https://bazel.build/concepts/labels">Label</a> | optional |  `"@rules_jsonnet//jsonnet:jsonnet_tool"`  |
 
 
 <a id="jsonnet_to_json"></a>
@@ -70,7 +69,7 @@ Example:
 <pre>
 jsonnet_to_json(<a href="#jsonnet_to_json-name">name</a>, <a href="#jsonnet_to_json-deps">deps</a>, <a href="#jsonnet_to_json-src">src</a>, <a href="#jsonnet_to_json-data">data</a>, <a href="#jsonnet_to_json-outs">outs</a>, <a href="#jsonnet_to_json-code_vars">code_vars</a>, <a href="#jsonnet_to_json-ext_code">ext_code</a>, <a href="#jsonnet_to_json-ext_code_envs">ext_code_envs</a>, <a href="#jsonnet_to_json-ext_code_file_vars">ext_code_file_vars</a>,
                 <a href="#jsonnet_to_json-ext_code_files">ext_code_files</a>, <a href="#jsonnet_to_json-ext_str_envs">ext_str_envs</a>, <a href="#jsonnet_to_json-ext_str_file_vars">ext_str_file_vars</a>, <a href="#jsonnet_to_json-ext_str_files">ext_str_files</a>, <a href="#jsonnet_to_json-ext_strs">ext_strs</a>, <a href="#jsonnet_to_json-extra_args">extra_args</a>,
-                <a href="#jsonnet_to_json-imports">imports</a>, <a href="#jsonnet_to_json-jsonnet">jsonnet</a>, <a href="#jsonnet_to_json-multiple_outputs">multiple_outputs</a>, <a href="#jsonnet_to_json-out_dir">out_dir</a>, <a href="#jsonnet_to_json-stamp_keys">stamp_keys</a>, <a href="#jsonnet_to_json-tla_code">tla_code</a>, <a href="#jsonnet_to_json-tla_code_envs">tla_code_envs</a>,
+                <a href="#jsonnet_to_json-imports">imports</a>, <a href="#jsonnet_to_json-multiple_outputs">multiple_outputs</a>, <a href="#jsonnet_to_json-out_dir">out_dir</a>, <a href="#jsonnet_to_json-stamp_keys">stamp_keys</a>, <a href="#jsonnet_to_json-tla_code">tla_code</a>, <a href="#jsonnet_to_json-tla_code_envs">tla_code_envs</a>,
                 <a href="#jsonnet_to_json-tla_code_files">tla_code_files</a>, <a href="#jsonnet_to_json-tla_str_envs">tla_str_envs</a>, <a href="#jsonnet_to_json-tla_str_files">tla_str_files</a>, <a href="#jsonnet_to_json-tla_strs">tla_strs</a>, <a href="#jsonnet_to_json-vars">vars</a>, <a href="#jsonnet_to_json-yaml_stream">yaml_stream</a>)
 </pre>
 
@@ -200,7 +199,6 @@ Example:
 | <a id="jsonnet_to_json-ext_strs"></a>ext_strs |  -   | <a href="https://bazel.build/rules/lib/dict">Dictionary: String -> String</a> | optional |  `{}`  |
 | <a id="jsonnet_to_json-extra_args"></a>extra_args |  Additional command line arguments for the Jsonnet interpreter.<br><br>For example, setting this argument to `["--string"]` causes the interpreter to manifest the output file(s) as plain text instead of JSON.   | List of strings | optional |  `[]`  |
 | <a id="jsonnet_to_json-imports"></a>imports |  List of import `-J` flags to be passed to the `jsonnet` compiler.   | List of strings | optional |  `[]`  |
-| <a id="jsonnet_to_json-jsonnet"></a>jsonnet |  A jsonnet binary   | <a href="https://bazel.build/concepts/labels">Label</a> | optional |  `"@rules_jsonnet//jsonnet:jsonnet_tool"`  |
 | <a id="jsonnet_to_json-multiple_outputs"></a>multiple_outputs |  Set to `True` to explicitly enable multiple file output via the `jsonnet -m` flag.<br><br>This is used for the case where multiple file output is used but only for generating a single output file. For example:<br><br><pre><code>local foo = import "foo.jsonnet";&#10;&#10;{&#10;    "foo.json": foo,&#10;}</code></pre><br><br>This attribute is incompatible with `out_dir`.   | Boolean | optional |  `False`  |
 | <a id="jsonnet_to_json-out_dir"></a>out_dir |  Name of the directory where output files are stored.<br><br>If the names of output files are not known up front, this option can be used to write all output files to a single directory artifact. Files in this directory cannot be referenced individually.<br><br>This attribute is incompatible with `outs` and `multiple_outputs`.   | String | optional |  `""`  |
 | <a id="jsonnet_to_json-stamp_keys"></a>stamp_keys |  -   | List of strings | optional |  `[]`  |
@@ -221,7 +219,7 @@ Example:
 <pre>
 jsonnet_to_json_test(<a href="#jsonnet_to_json_test-name">name</a>, <a href="#jsonnet_to_json_test-deps">deps</a>, <a href="#jsonnet_to_json_test-src">src</a>, <a href="#jsonnet_to_json_test-data">data</a>, <a href="#jsonnet_to_json_test-canonicalize_golden">canonicalize_golden</a>, <a href="#jsonnet_to_json_test-code_vars">code_vars</a>, <a href="#jsonnet_to_json_test-error">error</a>, <a href="#jsonnet_to_json_test-ext_code">ext_code</a>,
                      <a href="#jsonnet_to_json_test-ext_code_envs">ext_code_envs</a>, <a href="#jsonnet_to_json_test-ext_code_file_vars">ext_code_file_vars</a>, <a href="#jsonnet_to_json_test-ext_code_files">ext_code_files</a>, <a href="#jsonnet_to_json_test-ext_str_envs">ext_str_envs</a>,
-                     <a href="#jsonnet_to_json_test-ext_str_file_vars">ext_str_file_vars</a>, <a href="#jsonnet_to_json_test-ext_str_files">ext_str_files</a>, <a href="#jsonnet_to_json_test-ext_strs">ext_strs</a>, <a href="#jsonnet_to_json_test-extra_args">extra_args</a>, <a href="#jsonnet_to_json_test-golden">golden</a>, <a href="#jsonnet_to_json_test-imports">imports</a>, <a href="#jsonnet_to_json_test-jsonnet">jsonnet</a>,
+                     <a href="#jsonnet_to_json_test-ext_str_file_vars">ext_str_file_vars</a>, <a href="#jsonnet_to_json_test-ext_str_files">ext_str_files</a>, <a href="#jsonnet_to_json_test-ext_strs">ext_strs</a>, <a href="#jsonnet_to_json_test-extra_args">extra_args</a>, <a href="#jsonnet_to_json_test-golden">golden</a>, <a href="#jsonnet_to_json_test-imports">imports</a>,
                      <a href="#jsonnet_to_json_test-output_file_contents">output_file_contents</a>, <a href="#jsonnet_to_json_test-regex">regex</a>, <a href="#jsonnet_to_json_test-stamp_keys">stamp_keys</a>, <a href="#jsonnet_to_json_test-tla_code">tla_code</a>, <a href="#jsonnet_to_json_test-tla_code_envs">tla_code_envs</a>, <a href="#jsonnet_to_json_test-tla_code_files">tla_code_files</a>,
                      <a href="#jsonnet_to_json_test-tla_str_envs">tla_str_envs</a>, <a href="#jsonnet_to_json_test-tla_str_files">tla_str_files</a>, <a href="#jsonnet_to_json_test-tla_strs">tla_strs</a>, <a href="#jsonnet_to_json_test-vars">vars</a>, <a href="#jsonnet_to_json_test-yaml_stream">yaml_stream</a>)
 </pre>
@@ -348,7 +346,6 @@ Example:
 | <a id="jsonnet_to_json_test-extra_args"></a>extra_args |  Additional command line arguments for the Jsonnet interpreter.<br><br>For example, setting this argument to `["--string"]` causes the interpreter to manifest the output file(s) as plain text instead of JSON.   | List of strings | optional |  `[]`  |
 | <a id="jsonnet_to_json_test-golden"></a>golden |  The expected (combined stdout and stderr) output to compare to the output of running `jsonnet` on `src`.   | <a href="https://bazel.build/concepts/labels">Label</a> | optional |  `None`  |
 | <a id="jsonnet_to_json_test-imports"></a>imports |  List of import `-J` flags to be passed to the `jsonnet` compiler.   | List of strings | optional |  `[]`  |
-| <a id="jsonnet_to_json_test-jsonnet"></a>jsonnet |  A jsonnet binary   | <a href="https://bazel.build/concepts/labels">Label</a> | optional |  `"@rules_jsonnet//jsonnet:jsonnet_tool"`  |
 | <a id="jsonnet_to_json_test-output_file_contents"></a>output_file_contents |  -   | Boolean | optional |  `True`  |
 | <a id="jsonnet_to_json_test-regex"></a>regex |  Set to 1 if `golden` contains a regex used to match the output of running `jsonnet` on `src`.   | Boolean | optional |  `False`  |
 | <a id="jsonnet_to_json_test-stamp_keys"></a>stamp_keys |  -   | List of strings | optional |  `[]`  |
@@ -362,29 +359,24 @@ Example:
 | <a id="jsonnet_to_json_test-yaml_stream"></a>yaml_stream |  -   | Boolean | optional |  `False`  |
 
 
-<a id="JsonnetLibraryInfo"></a>
+<a id="jsonnet_toolchain"></a>
 
-## JsonnetLibraryInfo
+## jsonnet_toolchain
 
 <pre>
-JsonnetLibraryInfo()
+jsonnet_toolchain(<a href="#jsonnet_toolchain-name">name</a>, <a href="#jsonnet_toolchain-compiler">compiler</a>, <a href="#jsonnet_toolchain-create_directory_flags">create_directory_flags</a>, <a href="#jsonnet_toolchain-manifest_file_support">manifest_file_support</a>)
 </pre>
 
+The Jsonnet compiler information.
 
+**ATTRIBUTES**
 
-**FIELDS**
-
-
-
-<a id="jsonnet_repositories"></a>
-
-## jsonnet_repositories
-
-<pre>
-jsonnet_repositories()
-</pre>
-
-Adds the external dependencies needed for the Jsonnet rules.
 
+| Name  | Description | Type | Mandatory | Default |
+| :------------- | :------------- | :------------- | :------------- | :------------- |
+| <a id="jsonnet_toolchain-name"></a>name |  A unique name for this target.   | <a href="https://bazel.build/concepts/labels#target-names">Name</a> | required |  |
+| <a id="jsonnet_toolchain-compiler"></a>compiler |  -   | <a href="https://bazel.build/concepts/labels">Label</a> | optional |  `None`  |
+| <a id="jsonnet_toolchain-create_directory_flags"></a>create_directory_flags |  The flags passed to the Jsonnet compiler when a directory must be created.   | List of strings | required |  |
+| <a id="jsonnet_toolchain-manifest_file_support"></a>manifest_file_support |  If the Jsonnet compiler supports writing the output filenames to a manifest file.   | Boolean | required |  |
 
 
diff --git a/examples/BUILD b/examples/BUILD
@@ -1,11 +1,11 @@
+load("@rules_jsonnet//jsonnet:jsonnet.bzl", "jsonnet_library", "jsonnet_to_json", "jsonnet_to_json_test")
+
 package(default_visibility = ["//visibility:public"])
 
 # This directory contains unit and regression tests that also serve as examples
 # for jsonnet rules.  The BUILD rules should not contain any jsonnet_to_json
 # rules as this is redundant with jsonnet_to_json_test rules.
 
-load("@rules_jsonnet//jsonnet:jsonnet.bzl", "jsonnet_library", "jsonnet_to_json", "jsonnet_to_json_test")
-
 jsonnet_library(
     name = "workflow",
     srcs = ["workflow.libsonnet"],

diff --git a/examples/MODULE.bazel b/examples/MODULE.bazel
@@ -9,8 +9,30 @@ local_path_override(
     path = "..",
 )
 
+jsonnet = use_extension("@rules_jsonnet//jsonnet:extensions.bzl", "jsonnet")
+
 bazel_dep(name = "other_module", version = "0.0.0")
 local_path_override(
     module_name = "other_module",
     path = "other_module",
 )
+
+bazel_dep(name = "other_toolchain_module", version = "0.0.0")
+local_path_override(
+    module_name = "other_toolchain_module",
+    path = "other_toolchain_module",
+)
+
+bazel_dep(name = "rules_rust", version = "0.41.1")
+
+rust = use_extension("@rules_rust//rust:extensions.bzl", "rust")
+rust.toolchain(
+    edition = "2021",
+    # Nightly version is required to be able to depend on a binary dependency
+    # with Cargo.
+    # See https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#artifact-dependencies.
+    versions = ["nightly/2024-04-05"],
+)
+
+use_repo(rust, "rust_toolchains")
+register_toolchains("@rust_toolchains//:all")
diff --git a/examples/invalid.out b/examples/invalid.out
@@ -1,3 +1 @@
-^RUNTIME ERROR: Foo\.
-	.*invalid\.jsonnet:15:1-13	($|\$
-	During evaluation	)
+^RUNTIME ERROR: Foo.*invalid\.jsonnet:15:1-13*
diff --git a/examples/other_module/MODULE.bazel b/examples/other_module/MODULE.bazel
@@ -4,3 +4,6 @@ module(
 )
 
 bazel_dep(name = "rules_jsonnet", version = "0.0.0")
+
+jsonnet = use_extension("@rules_jsonnet//jsonnet:extensions.bzl", "jsonnet")
+jsonnet.compiler(name = "rust")
diff --git a/examples/other_toolchain_module/MODULE.bazel b/examples/other_toolchain_module/MODULE.bazel
@@ -0,0 +1,13 @@
+# This module 'other_toolchain_module' is here to test multiple modules
+# providing different toolchains and the logic in the toolchain conflict
+# resolution logic.
+
+module(
+    name = "other_toolchain_module",
+    version = "0.0.0",
+)
+
+bazel_dep(name = "rules_jsonnet", version = "0.0.0")
+
+jsonnet = use_extension("@rules_jsonnet//jsonnet:extensions.bzl", "jsonnet")
+jsonnet.compiler(name = "rust")
diff --git a/examples/out_dir.jsonnet b/examples/out_dir.jsonnet
@@ -1,5 +1,4 @@
 {
   'hello.txt': 'Hello, Bazel!',
   'goodbye.txt': 'Goodbye, Bazel!',
-  'nested/nested.txt': 'This file is in a nested directory.',
 }