diff --git a/core/BUILD.bazel b/core/BUILD.bazel
index 4c79e613..67675cb4 100644
--- a/core/BUILD.bazel
+++ b/core/BUILD.bazel
@@ -1,4 +1,3 @@
-load("@bazel_skylib//:bzl_library.bzl", "bzl_library")
 load("//docs:stardoc.bzl", "generate")
 
 package(default_visibility = ["//visibility:public"])
@@ -9,47 +8,16 @@ filegroup(
     visibility = ["//visibility:public"],
 )
 
-# boilerplate for `bazel_tools`
-bzl_library(
-    name = "bazel_tools",
-    srcs = [
-        "@bazel_tools//tools:bzl_srcs",
-    ],
-)
-
-# define Bazel library and its dependencies for generating documentation. considered
-# in isolation we could immediately use
-#
-# generate(deps = [":srcs", <foreign dependencies> ], ...)
-#
-# but toolchain modules that import definitions from here require a target to
-# declare as their dependency for their own documentation rendering. same for
-# legacy documentation. one could possibly extract this highly repetitive
-# pattern into `generate()` itself, and capture its `deps=` attribute to
-# automatically create these Bazel library targets. this approach may become
-# meaningful once we want to generate legacy documentation for all the toolchains
-# at once, as those toolchains will also have to export their Bazel libraries
-# to make that convenient.
-bzl_library(
-    name = "nixpkgs",
-    srcs = [
+generate(
+    name = "README.md",
+    inputs = [
         "nixpkgs.bzl",
         "util.bzl",
     ],
-    visibility = ["//visibility:public"],
-    deps = [
-        ":bazel_tools",
-        "@bazel_skylib//lib:paths",
-    ],
-)
-
-generate(
-    name = "README.md",
-    input = "//:nixpkgs.bzl",
     symbol_names = [
         "nixpkgs_git_repository",
         "nixpkgs_local_repository",
         "nixpkgs_package",
     ],
-    deps = ["//:nixpkgs"],
+    deps = ["@bazel_skylib//lib:paths"],
 )
diff --git a/core/docs/stardoc.bzl b/core/docs/stardoc.bzl
index 2b5e07d5..f12f1194 100644
--- a/core/docs/stardoc.bzl
+++ b/core/docs/stardoc.bzl
@@ -1,15 +1,64 @@
+load("@bazel_skylib//:bzl_library.bzl", "bzl_library")
 load("@io_bazel_stardoc//stardoc:stardoc.bzl", _stardoc = "stardoc")
 
 def generate(
         name,
-        input,
+        inputs,
         error_message = None,
+        deps = [],
         **kwargs):
     """
-    create rules for generating documentation, copying a file into the source
-    tree containing it, and testing that the copying has actually happened
-    (since the copy rule must be run manually).
+    full-service documentation rendering
+
+    - make a Bazel library from `inputs`
+    - create rules for
+        - generating library documentation
+        - copying a file into the source tree containing it
+        - testing that the copying has actually happened
+          (since the copy rule must be run manually)
+
+    NOTE: library name is derived from first file in `inputs`, without extensions.
+
+    Args:
+        name: target file name for rendered documentation.
+        inputs: file names for Bazel library and documentation
+        error_message: custom error message to print if rendered documentation is not up to date.
+        deps: library dependencies of the `inputs` provided.
+        **kwargs: arguments for `stardoc`, most notably `symbol_names` to generate documentation for.
     """
+
+    # necessary boilerplate: to build a Bazel library, we always need to include
+    # `bazel_tools` as a dependency.
+    # since we will combine toolchain libraries with the core library, but only
+    # need `bazel_tools` dependency once, only create if not already there.
+    if not native.existing_rule("bazel_tools"):
+        bzl_library(
+            name = "bazel_tools",
+            srcs = [
+                "@bazel_tools//tools:bzl_srcs",
+            ],
+        )
+
+    # massage first input file name into nice rule name
+    lib = Label(absolute_label(inputs[0])).name.split(".")[0]
+    bzl_library(
+        name = lib,
+        srcs = inputs,
+        visibility = ["//visibility:public"],
+        deps = [":bazel_tools"] + deps,
+    )
+
+    # generate documentation into transient file
+    out = "_{}".format(name)
+    stardoc("__{}".format(name), out, inputs[0], deps = [lib], **kwargs)
+
+    # create rule to copy documentation into source tree
+    # has to be run manually! set up a commit hook for convenience?
+    copy_files(
+        name = "update-{}".format(name),
+        data = [(out, name)],
+    )
+
     if not error_message:
         error_message = [
             "{} is not up to date.",
@@ -18,15 +67,12 @@ def generate(
             "bazel run //{}:update-{}",
         ]
         error_message = "\n".join(error_message).format(name, native.package_name(), name)
-    out = "_{}".format(name)
-    stardoc("__{}".format(name), out, input, **kwargs)
-    copy_files(
-        name = "update-{}".format(name),
-        data = [(out, name)],
-    )
+
+    # create test that source tree is up to date with rendered documentation
     compare_files(
         name = "check-{}".format(name),
-        data = [(out, name)],
+        # expect target file at top level of current workspace, see `copy_files`
+        data = [(out, to_root(name))],
         error_message = error_message,
     )
 
@@ -77,3 +123,14 @@ def compare_files(name, data, error_message = ""):
         data = data,
         env = {"errormsg": error_message},
     )
+
+def to_root(label):
+    return "//:" + Label(absolute_label(label)).name
+
+def absolute_label(label):
+    # adapted from https://stackoverflow.com/a/66705640/18406610
+    if label.startswith("@") or label.startswith("/"):
+        return label
+    if label.startswith(":"):
+        return native.repository_name() + "//" + native.package_name() + label
+    return native.repository_name() + "//" + native.package_name() + ":" + label
diff --git a/docs/BUILD.bazel b/docs/BUILD.bazel
index f324bcf1..94c6d5ef 100644
--- a/docs/BUILD.bazel
+++ b/docs/BUILD.bazel
@@ -1,9 +1,8 @@
-load("@rules_nixpkgs_core//docs:stardoc.bzl", "compare_files", "copy_files", "stardoc")
+load("@rules_nixpkgs_core//docs:stardoc.bzl", "generate")
 
-stardoc(
-    name = "nixpkgs",
-    out = "nixpkgs.md",
-    input = "//nixpkgs:nixpkgs.bzl",
+generate(
+    name = "README.md",
+    inputs = ["//nixpkgs:nixpkgs.bzl"],
     symbol_names = [
         "nixpkgs_git_repository",
         "nixpkgs_local_repository",
@@ -12,102 +11,31 @@ stardoc(
         "nixpkgs_cc_configure_deprecated",
         "nixpkgs_java_configure",
         "nixpkgs_python_configure",
-        "nixpkgs_sh_posix_configure",
-    ],
-    deps = ["//nixpkgs"],
-)
-
-stardoc(
-    name = "core",
-    out = "core.md",
-    input = "@rules_nixpkgs_core//:nixpkgs.bzl",
-    symbol_names = [
-        "nixpkgs_git_repository",
-        "nixpkgs_local_repository",
-        "nixpkgs_package",
-    ],
-    deps = ["@rules_nixpkgs_core//:nixpkgs"],
-)
-
-stardoc(
-    name = "go",
-    out = "toolchains/go.md",
-    input = "//nixpkgs:toolchains/go.bzl",
-    symbol_names = [
+        "nixpkgs_rust_configure",
         "nixpkgs_go_configure",
+        "nixpkgs_sh_posix_configure",
     ],
-    deps = ["//nixpkgs:toolchains_go"],
-)
-
-genrule(
-    name = "readme",
-    srcs = [
-        "README.md.tpl",
-        "nixpkgs.md",
-        "toolchains/go.md",
+    deps = [
+        "@bazel_skylib//lib:new_sets",
+        "@bazel_skylib//lib:paths",
+        "@bazel_skylib//lib:sets",
+        "@bazel_skylib//lib:versions",
+        "@rules_nixpkgs_cc//:cc",
+        "@rules_nixpkgs_core//:nixpkgs",
+        "@rules_nixpkgs_go//:go",
+        "@rules_nixpkgs_java//:java",
+        "@rules_nixpkgs_posix//:posix",
+        "@rules_nixpkgs_python//:python",
+        "@rules_nixpkgs_rust//:rust",
     ],
-    outs = ["README.md"],
-    cmd = """$(POSIX_AWK) \\
-  <$(execpath README.md.tpl) \\
-  >$(OUTS) \\
-  '{
-      if (/{{nixpkgs}}/) {
-          RS="\\0";
-          getline content <"$(execpath nixpkgs.md)";
-          print content;
-          RS="\\n";
-      } else if (/{{toolchains_go}}/) {
-          RS="\\0";
-          getline content <"$(execpath toolchains/go.md)";
-          print content;
-          RS="\\n";
-      } else {
-          print
-      }
-  }'
-""",
-    toolchains = ["@rules_sh//sh/posix:make_variables"],
 )
 
-genrule(
-    name = "readme_core",
-    srcs = [
-        "README_core.md.tpl",
-        "core.md",
-    ],
-    outs = ["core/README.md"],
-    cmd = """$(POSIX_AWK) \\
-  <$(execpath README_core.md.tpl) \\
-  >$(OUTS) \\
-  '{
-      if (/{{core}}/) {
-          RS="\\0";
-          getline content <"$(execpath core.md)";
-          print content;
-          RS="\\n";
-      } else {
-          print
-      }
-  }'
-""",
-    toolchains = ["@rules_sh//sh/posix:make_variables"],
+alias(
+    name = "update-readme",
+    actual = "update-README.md",
 )
 
-compare_files(
+alias(
     name = "check-readme",
-    data = [
-        ("README.md", "//:README.md"),
-        ("core/README.md", "@rules_nixpkgs_core//:README.md"),
-    ],
-    error_message = """
-    The project README is not up-to-date.
-    Please update it using the following command.
-
-    bazel run //docs:update-readme
-    """,
-)
-
-copy_files(
-    name = "update-readme",
-    data = [("README.md", "core/README.md")],
+    actual = "check-README.md",
 )
diff --git a/docs/README.md.tpl b/docs/README.md.tpl
deleted file mode 100644
index 997f78b6..00000000
--- a/docs/README.md.tpl
+++ /dev/null
@@ -1,111 +0,0 @@
-<!-- Edit docs/README.md.tpl and run `bazel run //docs:update-readme` to change the project README. -->
-
-# Nixpkgs rules for Bazel
-
-[![Build status](https://badge.buildkite.com/79bd0a8aa1e47a92e0254ca3afe5f439776e6d389cfbde9d8c.svg?branch=master)](https://buildkite.com/tweag-1/rules-nixpkgs)
-
-Use [Nix][nix] and the [Nixpkgs][nixpkgs] package set to import
-external dependencies (like system packages) into [Bazel][bazel]
-hermetically. If the version of any dependency changes, Bazel will
-correctly rebuild targets, and only those targets that use the
-external dependencies that changed.
-
-Links:
-* [Nix + Bazel = fully reproducible, incremental
-  builds][blog-bazel-nix] (blog post)
-* [Nix + Bazel][youtube-bazel-nix] (lightning talk)
-
-[nix]: https://nixos.org/nix
-[nixpkgs]: https://github.com/NixOS/nixpkgs
-[bazel]: https://bazel.build
-[blog-bazel-nix]: https://www.tweag.io/posts/2018-03-15-bazel-nix.html
-[youtube-bazel-nix]: https://www.youtube.com/watch?v=hDdDUrty1Gw
-
-## Rules
-
-* [nixpkgs_git_repository](#nixpkgs_git_repository)
-* [nixpkgs_local_repository](#nixpkgs_local_repository)
-* [nixpkgs_package](#nixpkgs_package)
-* [nixpkgs_cc_configure](#nixpkgs_cc_configure)
-* [nixpkgs_cc_configure_deprecated](#nixpkgs_cc_configure_deprecated)
-* [nixpkgs_java_configure](#nixpkgs_java_configure)
-* [nixpkgs_python_configure](#nixpkgs_python_configure)
-* [nixpkgs_sh_posix_configure](#nixpkgs_sh_posix_configure)
-* [nixpkgs_go_configure](#nixpkgs_go_configure)
-
-## Setup
-
-Add the following to your `WORKSPACE` file, and select a `$COMMIT` accordingly.
-
-```bzl
-http_archive(
-    name = "io_tweag_rules_nixpkgs",
-    strip_prefix = "rules_nixpkgs-$COMMIT",
-    urls = ["https://github.com/tweag/rules_nixpkgs/archive/$COMMIT.tar.gz"],
-)
-
-load("@io_tweag_rules_nixpkgs//nixpkgs:repositories.bzl", "rules_nixpkgs_dependencies")
-rules_nixpkgs_dependencies()
-
-load("@io_tweag_rules_nixpkgs//nixpkgs:nixpkgs.bzl", "nixpkgs_git_repository", "nixpkgs_package", "nixpkgs_cc_configure")
-
-load("@io_tweag_rules_nixpkgs//nixpkgs:toolchains/go.bzl", "nixpkgs_go_configure") # optional
-```
-
-If you use `rules_nixpkgs` to configure a toolchain, then you will also need to
-configure the build platform to include the
-`@io_tweag_rules_nixpkgs//nixpkgs/constraints:support_nix` constraint. For
-example by adding the following to `.bazelrc`:
-
-```
-build --host_platform=@io_tweag_rules_nixpkgs//nixpkgs/platforms:host
-```
-
-## Example
-
-```bzl
-nixpkgs_git_repository(
-    name = "nixpkgs",
-    revision = "17.09", # Any tag or commit hash
-    sha256 = "" # optional sha to verify package integrity!
-)
-
-nixpkgs_package(
-    name = "hello",
-    repositories = { "nixpkgs": "@nixpkgs//:default.nix" }
-)
-```
-
-## Rules
-
-{{nixpkgs}}
-
-{{toolchains_go}}
-
-## Migration from older releases
-
-### `path` Attribute (removed in 0.3)
-
-`path` was an attribute from the early days of `rules_nixpkgs`, and
-its ability to reference arbitrary paths is a danger to build hermeticity.
-
-Replace it with either `nixpkgs_git_repository` if you need
-a specific version of `nixpkgs`. If you absolutely *must* depend on a
-local folder, use Bazel’s
-[`local_repository` workspace rule](https://docs.bazel.build/versions/master/be/workspace.html#local_repository).
-Both approaches work well with the `repositories` attribute of `nixpkgs_package`.
-
-```bzl
-local_repository(
-  name = "local-nixpkgs",
-  path = "/path/to/nixpkgs",
-)
-
-nixpkgs_package(
-  name = "somepackage",
-  repositories = {
-    "nixpkgs": "@local-nixpkgs//:default.nix",
-  },
-  …
-)
-```
diff --git a/docs/README_core.md.tpl b/docs/README_core.md.tpl
deleted file mode 100644
index 6b322bd4..00000000
--- a/docs/README_core.md.tpl
+++ /dev/null
@@ -1,5 +0,0 @@
-# Nixpkgs for Bazel
-
-## Rules
-
-{{core}}
\ No newline at end of file
diff --git a/nixpkgs/BUILD.bazel b/nixpkgs/BUILD.bazel
index 5b8d9d46..8d13f304 100644
--- a/nixpkgs/BUILD.bazel
+++ b/nixpkgs/BUILD.bazel
@@ -1,70 +1,7 @@
-load("@bazel_skylib//:bzl_library.bzl", "bzl_library")
-
 package(default_visibility = ["//visibility:public"])
 
-exports_files([
-    "nixpkgs.bzl",
-])
-
 filegroup(
     name = "srcs",
     srcs = glob(["**"]),
     visibility = ["//visibility:public"],
 )
-
-# @bazel_tools//tools does not define a bzl_library itself, instead we are
-# supposed to define our own using the @bazel_tools//tools:bzl_srcs filegroup.
-# See https://github.com/bazelbuild/skydoc/issues/166
-bzl_library(
-    name = "bazel_tools",
-    srcs = [
-        "@bazel_tools//tools:bzl_srcs",
-    ],
-)
-
-bzl_library(
-    name = "repositories",
-    srcs = [
-        "repositories.bzl",
-    ],
-    visibility = ["//visibility:public"],
-    deps = [
-        ":bazel_tools",
-    ],
-)
-
-bzl_library(
-    name = "nixpkgs",
-    srcs = [
-        "nixpkgs.bzl",
-    ],
-    visibility = ["//visibility:public"],
-    deps = [
-        ":bazel_tools",
-        "@bazel_skylib//lib:new_sets",
-        "@bazel_skylib//lib:paths",
-        "@bazel_skylib//lib:sets",
-        "@bazel_skylib//lib:versions",
-        "@rules_nixpkgs_cc//:cc.bzl",
-        "@rules_nixpkgs_core//:nixpkgs",
-        "@rules_nixpkgs_go//:go.bzl",
-        "@rules_nixpkgs_java//:java.bzl",
-        "@rules_nixpkgs_posix//:posix.bzl",
-        "@rules_nixpkgs_python//:python.bzl",
-        "@rules_nixpkgs_rust//:rust.bzl",
-    ],
-)
-
-bzl_library(
-    name = "toolchains_go",
-    srcs = [
-        "toolchains/go.bzl",
-    ],
-    visibility = ["//visibility:public"],
-    deps = [
-        ":bazel_tools",
-        ":nixpkgs",
-        "@io_bazel_rules_go//go:deps",
-        "@rules_nixpkgs_go//:go.bzl",
-    ],
-)
diff --git a/nixpkgs/nixpkgs.bzl b/nixpkgs/nixpkgs.bzl
index e66c60e8..7222f875 100644
--- a/nixpkgs/nixpkgs.bzl
+++ b/nixpkgs/nixpkgs.bzl
@@ -1,4 +1,109 @@
-"""Rules for importing Nixpkgs packages."""
+"""<!-- Edit docs/README.md.tpl and run `bazel run //docs:update-readme` to change the project README. -->
+
+# Nixpkgs rules for Bazel
+
+[![Build status](https://badge.buildkite.com/79bd0a8aa1e47a92e0254ca3afe5f439776e6d389cfbde9d8c.svg?branch=master)](https://buildkite.com/tweag-1/rules-nixpkgs)
+
+Use [Nix][nix] and the [Nixpkgs][nixpkgs] package set to import
+external dependencies (like system packages) into [Bazel][bazel]
+hermetically. If the version of any dependency changes, Bazel will
+correctly rebuild targets, and only those targets that use the
+external dependencies that changed.
+
+Links:
+* [Nix + Bazel = fully reproducible, incremental
+  builds][blog-bazel-nix] (blog post)
+* [Nix + Bazel][youtube-bazel-nix] (lightning talk)
+
+[nix]: https://nixos.org/nix
+[nixpkgs]: https://github.com/NixOS/nixpkgs
+[bazel]: https://bazel.build
+[blog-bazel-nix]: https://www.tweag.io/posts/2018-03-15-bazel-nix.html
+[youtube-bazel-nix]: https://www.youtube.com/watch?v=hDdDUrty1Gw
+
+## Rules
+
+* [nixpkgs_git_repository](#nixpkgs_git_repository)
+* [nixpkgs_local_repository](#nixpkgs_local_repository)
+* [nixpkgs_package](#nixpkgs_package)
+* [nixpkgs_cc_configure](#nixpkgs_cc_configure)
+* [nixpkgs_cc_configure_deprecated](#nixpkgs_cc_configure_deprecated)
+* [nixpkgs_java_configure](#nixpkgs_java_configure)
+* [nixpkgs_python_configure](#nixpkgs_python_configure)
+* [nixpkgs_go_configure](#nixpkgs_go_configure)
+* [nixpkgs_rust_configure](#nixpkgs_rust_configure)
+* [nixpkgs_sh_posix_configure](#nixpkgs_sh_posix_configure)
+
+## Setup
+
+Add the following to your `WORKSPACE` file, and select a `$COMMIT` accordingly.
+
+```bzl
+http_archive(
+    name = "io_tweag_rules_nixpkgs",
+    strip_prefix = "rules_nixpkgs-$COMMIT",
+    urls = ["https://github.com/tweag/rules_nixpkgs/archive/$COMMIT.tar.gz"],
+)
+
+load("@io_tweag_rules_nixpkgs//nixpkgs:repositories.bzl", "rules_nixpkgs_dependencies")
+rules_nixpkgs_dependencies()
+
+load("@io_tweag_rules_nixpkgs//nixpkgs:nixpkgs.bzl", "nixpkgs_git_repository", "nixpkgs_package", "nixpkgs_cc_configure")
+
+load("@io_tweag_rules_nixpkgs//nixpkgs:toolchains/go.bzl", "nixpkgs_go_configure") # optional
+```
+
+If you use `rules_nixpkgs` to configure a toolchain, then you will also need to
+configure the build platform to include the
+`@io_tweag_rules_nixpkgs//nixpkgs/constraints:support_nix` constraint. For
+example by adding the following to `.bazelrc`:
+
+```
+build --host_platform=@io_tweag_rules_nixpkgs//nixpkgs/platforms:host
+```
+
+## Example
+
+```bzl
+nixpkgs_git_repository(
+    name = "nixpkgs",
+    revision = "17.09", # Any tag or commit hash
+    sha256 = "" # optional sha to verify package integrity!
+)
+
+nixpkgs_package(
+    name = "hello",
+    repositories = { "nixpkgs": "@nixpkgs//:default.nix" }
+)
+```
+
+## Migration from older releases
+
+### `path` Attribute (removed in 0.3)
+
+`path` was an attribute from the early days of `rules_nixpkgs`, and
+its ability to reference arbitrary paths is a danger to build hermeticity.
+
+Replace it with either `nixpkgs_git_repository` if you need
+a specific version of `nixpkgs`. If you absolutely *must* depend on a
+local folder, use Bazel's
+[`local_repository` workspace rule](https://docs.bazel.build/versions/master/be/workspace.html#local_repository).
+Both approaches work well with the `repositories` attribute of `nixpkgs_package`.
+
+```bzl
+local_repository(
+  name = "local-nixpkgs",
+  path = "/path/to/nixpkgs",
+)
+
+nixpkgs_package(
+  name = "somepackage",
+  repositories = {
+    "nixpkgs": "@local-nixpkgs//:default.nix",
+  },
+)
+```
+"""
 
 load(
     "@bazel_tools//tools/cpp:lib_cc_configure.bzl",
diff --git a/toolchains/cc/BUILD.bazel b/toolchains/cc/BUILD.bazel
index 5a979d5b..e9c3dea2 100644
--- a/toolchains/cc/BUILD.bazel
+++ b/toolchains/cc/BUILD.bazel
@@ -10,7 +10,7 @@ filegroup(
 
 generate(
     name = "README.md",
-    input = "//:cc.bzl",
+    inputs = ["//:cc.bzl"],
     symbol_names = [
         "nixpkgs_cc_configure",
     ],
diff --git a/toolchains/go/BUILD.bazel b/toolchains/go/BUILD.bazel
index 2d51bbfc..808c6bb5 100644
--- a/toolchains/go/BUILD.bazel
+++ b/toolchains/go/BUILD.bazel
@@ -10,7 +10,7 @@ filegroup(
 
 generate(
     name = "README.md",
-    input = "//:go.bzl",
+    inputs = ["//:go.bzl"],
     symbol_names = [
         "nixpkgs_go_configure",
     ],
diff --git a/toolchains/java/BUILD.bazel b/toolchains/java/BUILD.bazel
index c10f0cff..0ce62268 100644
--- a/toolchains/java/BUILD.bazel
+++ b/toolchains/java/BUILD.bazel
@@ -10,7 +10,7 @@ filegroup(
 
 generate(
     name = "README.md",
-    input = "//:java.bzl",
+    inputs = ["//:java.bzl"],
     symbol_names = [
         "nixpkgs_java_configure",
     ],
diff --git a/toolchains/posix/BUILD.bazel b/toolchains/posix/BUILD.bazel
index ff004659..29652c99 100644
--- a/toolchains/posix/BUILD.bazel
+++ b/toolchains/posix/BUILD.bazel
@@ -10,7 +10,7 @@ filegroup(
 
 generate(
     name = "README.md",
-    input = "//:posix.bzl",
+    inputs = ["//:posix.bzl"],
     symbol_names = [
         "nixpkgs_sh_posix_configure",
     ],
diff --git a/toolchains/python/BUILD.bazel b/toolchains/python/BUILD.bazel
index b8a67011..9721e335 100644
--- a/toolchains/python/BUILD.bazel
+++ b/toolchains/python/BUILD.bazel
@@ -10,7 +10,7 @@ filegroup(
 
 generate(
     name = "README.md",
-    input = "//:python.bzl",
+    inputs = ["//:python.bzl"],
     symbol_names = [
         "nixpkgs_python_configure",
     ],
diff --git a/toolchains/rust/BUILD.bazel b/toolchains/rust/BUILD.bazel
index 51f93643..350f9248 100644
--- a/toolchains/rust/BUILD.bazel
+++ b/toolchains/rust/BUILD.bazel
@@ -10,7 +10,7 @@ filegroup(
 
 generate(
     name = "README.md",
-    input = "//:rust.bzl",
+    inputs = ["//:rust.bzl"],
     symbol_names = [
         "nixpkgs_rust_configure",
     ],