Remove uses of `BAZEL_VERSION` for detection of pre-1.0 Bazel. (#508)
This PR removes:
* The special cases for pre-1.0 Bazel versions in `rustc.bzl`
* `BAZEL_VERSION` and `@ io_bazel_rules_rust_bazel_version`, which no longer have any references.
* `rust_workspace()` in `//:workspace.bzl`, which was obsolete due to no longer needing to define the Bazel version repository.
The remaining behavior of `rust_workspace()` was to define toolchains for Starlark unit testing, which are used by `rules_rust` itself but not necessary for downstream consumers. I moved that part to `//:WORKSPACE`.
For compatibility, I left the `rust_workspace()` symbol defined but empty (except for a warning message). It ought to be deleted in a future PR once users have removed it from their `WORKSPACE` files.
Fixes https://github.com/bazelbuild/rules_rust/issues/462
diff --git a/WORKSPACE b/WORKSPACE
index 1f8161c..92d94d0 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -16,9 +16,9 @@
rust_wasm_bindgen_repositories()
-load("@io_bazel_rules_rust//:workspace.bzl", "rust_workspace")
+load("@bazel_skylib//:workspace.bzl", "bazel_skylib_workspace")
-rust_workspace()
+bazel_skylib_workspace()
# --- end stardoc
