Remove unused rust.bzl file (#1002)

* Remove unused rust.bzl file

* Regenerate documentation

docs/flatten.md

@@ -178,25 +178,6 @@ Add additional rustc_flags from the command line with `--@rules_rust//:extra_rus
 | <a id="extra_rustc_flags-name"></a>name |  A unique name for this target.   | <a href="https://bazel.build/docs/build-ref.html#name">Name</a> | required |  |
 
 
-<a id="#fail_when_enabled"></a>
-
-## fail_when_enabled
-
-<pre>
-fail_when_enabled(<a href="#fail_when_enabled-name">name</a>, <a href="#fail_when_enabled-flag">flag</a>)
-</pre>
-
-A rule that will fail analysis when a flag is enabled.
-
-**ATTRIBUTES**
-
-
-| Name  | Description | Type | Mandatory | Default |
-| :------------- | :------------- | :------------- | :------------- | :------------- |
-| <a id="fail_when_enabled-name"></a>name |  A unique name for this target.   | <a href="https://bazel.build/docs/build-ref.html#name">Name</a> | required |  |
-| <a id="fail_when_enabled-flag"></a>flag |  The incompatible flag to check   | String | required |  |
-
-
 <a id="#incompatible_flag"></a>
 
 ## incompatible_flag

docs/settings.md

@@ -4,25 +4,6 @@
 * [incompatible_flag](#incompatible_flag)
 * [fail_when_enabled](#fail_when_enabled)
 
-<a id="#fail_when_enabled"></a>
-
-## fail_when_enabled
-
-<pre>
-fail_when_enabled(<a href="#fail_when_enabled-name">name</a>, <a href="#fail_when_enabled-flag">flag</a>)
-</pre>
-
-A rule that will fail analysis when a flag is enabled.
-
-**ATTRIBUTES**
-
-
-| Name  | Description | Type | Mandatory | Default |
-| :------------- | :------------- | :------------- | :------------- | :------------- |
-| <a id="fail_when_enabled-name"></a>name |  A unique name for this target.   | <a href="https://bazel.build/docs/build-ref.html#name">Name</a> | required |  |
-| <a id="fail_when_enabled-flag"></a>flag |  The incompatible flag to check   | String | required |  |
-
-
 <a id="#incompatible_flag"></a>
 
 ## incompatible_flag

docs/symbols.bzl

@@ -83,7 +83,6 @@ load(
 )
 load(
     "@rules_rust//rust/settings:incompatible.bzl",
-    _fail_when_enabled = "fail_when_enabled",
     _incompatible_flag = "incompatible_flag",
 )
 load(
@@ -147,7 +146,6 @@ rustfmt_test = _rustfmt_test
 error_format = _error_format
 extra_rustc_flags = _extra_rustc_flags
 incompatible_flag = _incompatible_flag
-fail_when_enabled = _fail_when_enabled
 capture_clippy_output = _capture_clippy_output
 
 CrateInfo = _CrateInfo

rust/BUILD.bazel

@@ -5,7 +5,6 @@ package(default_visibility = ["//visibility:public"])
 exports_files([
     "known_shas.bzl",
     "repositories.bzl",
-    "rust.bzl",
     "defs.bzl",
     "toolchain.bzl",
 ])

rust/private/common.bzl

@@ -17,7 +17,7 @@
 This module is meant to be used by custom rules that need to compile Rust code
 and cannot simply rely on writing a macro that wraps `rust_library`. This module
 provides the lower-level interface to Rust providers, actions, and functions.
-Do not load this file directly; instead, load the top-level `rust.bzl` file,
+Do not load this file directly; instead, load the top-level `defs.bzl` file,
 which exports the `rust_common` struct.
 
 In the Bazel lingo, `rust_common` gives the access to the Rust Sandwich API.

rust/settings/BUILD.bazel

@@ -3,12 +3,6 @@ load(":incompatible.bzl", "incompatible_flag")
 
 package(default_visibility = ["//visibility:public"])
 
-incompatible_flag(
-    name = "split_rust_library",
-    build_setting_default = True,
-    issue = "https://github.com/bazelbuild/rules_rust/issues/591",
-)
-
 incompatible_flag(
     name = "incompatible_make_rust_providers_target_independent",
     build_setting_default = True,

rust/settings/incompatible.bzl

@@ -25,21 +25,3 @@ incompatible_flag = rule(
         ),
     },
 )
-
-def _fail_when_enabled_impl(ctx):
-    flag = ctx.attr.flag
-    flag_info = getattr(ctx.attr, "_" + flag)[IncompatibleFlagInfo]
-    if flag_info.enabled:
-        fail("Incompatible flag {} has been flipped, see {} for details.".format(flag, flag_info.issue))
-
-fail_when_enabled = rule(
-    doc = "A rule that will fail analysis when a flag is enabled.",
-    implementation = _fail_when_enabled_impl,
-    attrs = {
-        "flag": attr.string(
-            doc = "The incompatible flag to check",
-            mandatory = True,
-        ),
-        "_split_rust_library": attr.label(default = "//rust/settings:split_rust_library"),
-    },
-)