versions.check needs documentation/better error message explaining it can only be used in repository rules about bazel-skylib HOT 6 OPEN

http_archive(
    name = "bazel_skylib",
    sha256 = "bbccf674aa441c266df9894182d80de104cabd19be98be002f6d478aaa31574d",
    strip_prefix = "bazel-skylib-2169ae1c374aab4a09aa90e65efe1a3aad4e279b",
    urls = [
        "https://github.com/bazelbuild/bazel-skylib/archive/2169ae1c374aab4a09aa90e65efe1a3aad4e279b.tar.gz",
    ],
)

→ bazel version
Build label: 0.10.0-homebrew
Build target: bazel-out/darwin-opt/bin/src/main/java/com/google/devtools/build/lib/bazel/BazelServer_deploy.jar
Build time: Tue Jan 9 21:07:27 +50057 (1517479996047)
Build timestamp: 1517479996047
Build timestamp as int: 1517479996047

→ cat WORKSPACE
workspace(name = "bazel_skylib")

load(":lib.bzl", "versions")

versions.check(minimum_bazel_version="0.9.0")

→ bazel build //...
INFO: Analysed 38 targets (11 packages loaded).
INFO: Found 38 targets...
INFO: Elapsed time: 0.698s, Critical Path: 0.02s
INFO: Build completed successfully, 1 total action

→ cat WORKSPACE
workspace(name = "bazel_skylib")

load(":lib.bzl", "versions")

versions.check(minimum_bazel_version="0.11.0")

→ bazel build //...
ERROR: /Users/jin/Code/bazel-skylib/WORKSPACE:5:1: Traceback (most recent call last):
	File "/Users/jin/Code/bazel-skylib/WORKSPACE", line 5
		versions.check(minimum_bazel_version = "0.11.0")
	File "/Users/jin/Code/bazel-skylib/lib/versions.bzl", line 107, in versions.check
		fail("\nCurrent Bazel version is {}, ...))

Current Bazel version is 0.10.0-homebrew, expected at least 0.11.0
ERROR: Error evaluating WORKSPACE file
ERROR: error loading package 'external': Package 'external' contains errors
INFO: Elapsed time: 0.167s
FAILED: Build did NOT complete successfully (0 packages loaded)