Renamed `rust_toolchain.rust_lib` to `rust_toolchain.rust_std` (#1102)

diff --git a/cargo/cargo_build_script.bzl b/cargo/cargo_build_script.bzl
index ea22844..8949173 100644
--- a/cargo/cargo_build_script.bzl
+++ b/cargo/cargo_build_script.bzl
@@ -58,7 +58,7 @@
     toolchain_tools = [
         # Needed for rustc to function.
         toolchain.rustc_lib.files,
-        toolchain.rust_lib.files,
+        toolchain.rust_std.files,
     ]
 
     cc_toolchain = find_cpp_toolchain(ctx)
diff --git a/docs/flatten.md b/docs/flatten.md
index 557ab5f..1c05343 100644
--- a/docs/flatten.md
+++ b/docs/flatten.md
@@ -1103,8 +1103,8 @@
 
 <pre>
 rust_toolchain(<a href="#rust_toolchain-name">name</a>, <a href="#rust_toolchain-allocator_library">allocator_library</a>, <a href="#rust_toolchain-binary_ext">binary_ext</a>, <a href="#rust_toolchain-cargo">cargo</a>, <a href="#rust_toolchain-clippy_driver">clippy_driver</a>, <a href="#rust_toolchain-debug_info">debug_info</a>,
-               <a href="#rust_toolchain-default_edition">default_edition</a>, <a href="#rust_toolchain-dylib_ext">dylib_ext</a>, <a href="#rust_toolchain-exec_triple">exec_triple</a>, <a href="#rust_toolchain-opt_level">opt_level</a>, <a href="#rust_toolchain-os">os</a>, <a href="#rust_toolchain-rust_doc">rust_doc</a>, <a href="#rust_toolchain-rust_lib">rust_lib</a>, <a href="#rust_toolchain-rustc">rustc</a>,
-               <a href="#rust_toolchain-rustc_lib">rustc_lib</a>, <a href="#rust_toolchain-rustc_srcs">rustc_srcs</a>, <a href="#rust_toolchain-rustfmt">rustfmt</a>, <a href="#rust_toolchain-staticlib_ext">staticlib_ext</a>, <a href="#rust_toolchain-stdlib_linkflags">stdlib_linkflags</a>, <a href="#rust_toolchain-target_json">target_json</a>,
+               <a href="#rust_toolchain-default_edition">default_edition</a>, <a href="#rust_toolchain-dylib_ext">dylib_ext</a>, <a href="#rust_toolchain-exec_triple">exec_triple</a>, <a href="#rust_toolchain-opt_level">opt_level</a>, <a href="#rust_toolchain-os">os</a>, <a href="#rust_toolchain-rust_doc">rust_doc</a>, <a href="#rust_toolchain-rust_lib">rust_lib</a>, <a href="#rust_toolchain-rust_std">rust_std</a>,
+               <a href="#rust_toolchain-rustc">rustc</a>, <a href="#rust_toolchain-rustc_lib">rustc_lib</a>, <a href="#rust_toolchain-rustc_srcs">rustc_srcs</a>, <a href="#rust_toolchain-rustfmt">rustfmt</a>, <a href="#rust_toolchain-staticlib_ext">staticlib_ext</a>, <a href="#rust_toolchain-stdlib_linkflags">stdlib_linkflags</a>, <a href="#rust_toolchain-target_json">target_json</a>,
                <a href="#rust_toolchain-target_triple">target_triple</a>)
 </pre>
 
@@ -1123,7 +1123,7 @@
     name = "rust_cpuX_impl",
     rustc = "@rust_cpuX//:rustc",
     rustc_lib = "@rust_cpuX//:rustc_lib",
-    rust_lib = "@rust_cpuX//:rust_lib",
+    rust_std = "@rust_cpuX//:rust_std",
     rust_doc = "@rust_cpuX//:rustdoc",
     binary_ext = "",
     staticlib_ext = ".a",
@@ -1166,13 +1166,14 @@
 | <a id="rust_toolchain-opt_level"></a>opt_level |  Rustc optimization levels.   | <a href="https://bazel.build/docs/skylark/lib/dict.html">Dictionary: String -> String</a> | optional | {"dbg": "0", "fastbuild": "0", "opt": "3"} |
 | <a id="rust_toolchain-os"></a>os |  The operating system for the current toolchain   | String | required |  |
 | <a id="rust_toolchain-rust_doc"></a>rust_doc |  The location of the <code>rustdoc</code> binary. Can be a direct source or a filegroup containing one item.   | <a href="https://bazel.build/docs/build-ref.html#labels">Label</a> | optional | None |
-| <a id="rust_toolchain-rust_lib"></a>rust_lib |  The rust standard library.   | <a href="https://bazel.build/docs/build-ref.html#labels">Label</a> | optional | None |
+| <a id="rust_toolchain-rust_lib"></a>rust_lib |  **Deprecated**: Use <code>rust_std</code>   | <a href="https://bazel.build/docs/build-ref.html#labels">Label</a> | optional | None |
+| <a id="rust_toolchain-rust_std"></a>rust_std |  The Rust standard library.   | <a href="https://bazel.build/docs/build-ref.html#labels">Label</a> | optional | None |
 | <a id="rust_toolchain-rustc"></a>rustc |  The location of the <code>rustc</code> binary. Can be a direct source or a filegroup containing one item.   | <a href="https://bazel.build/docs/build-ref.html#labels">Label</a> | optional | None |
 | <a id="rust_toolchain-rustc_lib"></a>rustc_lib |  The libraries used by rustc during compilation.   | <a href="https://bazel.build/docs/build-ref.html#labels">Label</a> | optional | None |
 | <a id="rust_toolchain-rustc_srcs"></a>rustc_srcs |  The source code of rustc.   | <a href="https://bazel.build/docs/build-ref.html#labels">Label</a> | optional | None |
 | <a id="rust_toolchain-rustfmt"></a>rustfmt |  The location of the <code>rustfmt</code> binary. Can be a direct source or a filegroup containing one item.   | <a href="https://bazel.build/docs/build-ref.html#labels">Label</a> | optional | None |
 | <a id="rust_toolchain-staticlib_ext"></a>staticlib_ext |  The extension for static libraries created from rustc.   | String | required |  |
-| <a id="rust_toolchain-stdlib_linkflags"></a>stdlib_linkflags |  Additional linker flags to use when Rust std lib is linked by a C++ linker (rustc will deal with these automatically). Subject to location expansion with respect to the srcs of the rust_lib attribute.   | List of strings | required |  |
+| <a id="rust_toolchain-stdlib_linkflags"></a>stdlib_linkflags |  Additional linker flags to use when Rust standard library is linked by a C++ linker (rustc will deal with these automatically). Subject to location expansion with respect to the srcs of the <code>rust_std</code> attribute.   | List of strings | required |  |
 | <a id="rust_toolchain-target_json"></a>target_json |  Override the target_triple with a custom target specification. For more details see: https://doc.rust-lang.org/rustc/targets/custom.html   | <a href="https://bazel.build/docs/build-ref.html#labels">Label</a> | optional | None |
 | <a id="rust_toolchain-target_triple"></a>target_triple |  The platform triple for the toolchains target environment. For more details see: https://docs.bazel.build/versions/master/skylark/rules.html#configurations   | String | optional | "" |
 
diff --git a/docs/rust_repositories.md b/docs/rust_repositories.md
index f404c50..7d1b1f7 100644
--- a/docs/rust_repositories.md
+++ b/docs/rust_repositories.md
@@ -33,8 +33,8 @@
 
 <pre>
 rust_toolchain(<a href="#rust_toolchain-name">name</a>, <a href="#rust_toolchain-allocator_library">allocator_library</a>, <a href="#rust_toolchain-binary_ext">binary_ext</a>, <a href="#rust_toolchain-cargo">cargo</a>, <a href="#rust_toolchain-clippy_driver">clippy_driver</a>, <a href="#rust_toolchain-debug_info">debug_info</a>,
-               <a href="#rust_toolchain-default_edition">default_edition</a>, <a href="#rust_toolchain-dylib_ext">dylib_ext</a>, <a href="#rust_toolchain-exec_triple">exec_triple</a>, <a href="#rust_toolchain-opt_level">opt_level</a>, <a href="#rust_toolchain-os">os</a>, <a href="#rust_toolchain-rust_doc">rust_doc</a>, <a href="#rust_toolchain-rust_lib">rust_lib</a>, <a href="#rust_toolchain-rustc">rustc</a>,
-               <a href="#rust_toolchain-rustc_lib">rustc_lib</a>, <a href="#rust_toolchain-rustc_srcs">rustc_srcs</a>, <a href="#rust_toolchain-rustfmt">rustfmt</a>, <a href="#rust_toolchain-staticlib_ext">staticlib_ext</a>, <a href="#rust_toolchain-stdlib_linkflags">stdlib_linkflags</a>, <a href="#rust_toolchain-target_json">target_json</a>,
+               <a href="#rust_toolchain-default_edition">default_edition</a>, <a href="#rust_toolchain-dylib_ext">dylib_ext</a>, <a href="#rust_toolchain-exec_triple">exec_triple</a>, <a href="#rust_toolchain-opt_level">opt_level</a>, <a href="#rust_toolchain-os">os</a>, <a href="#rust_toolchain-rust_doc">rust_doc</a>, <a href="#rust_toolchain-rust_lib">rust_lib</a>, <a href="#rust_toolchain-rust_std">rust_std</a>,
+               <a href="#rust_toolchain-rustc">rustc</a>, <a href="#rust_toolchain-rustc_lib">rustc_lib</a>, <a href="#rust_toolchain-rustc_srcs">rustc_srcs</a>, <a href="#rust_toolchain-rustfmt">rustfmt</a>, <a href="#rust_toolchain-staticlib_ext">staticlib_ext</a>, <a href="#rust_toolchain-stdlib_linkflags">stdlib_linkflags</a>, <a href="#rust_toolchain-target_json">target_json</a>,
                <a href="#rust_toolchain-target_triple">target_triple</a>)
 </pre>
 
@@ -53,7 +53,7 @@
     name = "rust_cpuX_impl",
     rustc = "@rust_cpuX//:rustc",
     rustc_lib = "@rust_cpuX//:rustc_lib",
-    rust_lib = "@rust_cpuX//:rust_lib",
+    rust_std = "@rust_cpuX//:rust_std",
     rust_doc = "@rust_cpuX//:rustdoc",
     binary_ext = "",
     staticlib_ext = ".a",
@@ -96,13 +96,14 @@
 | <a id="rust_toolchain-opt_level"></a>opt_level |  Rustc optimization levels.   | <a href="https://bazel.build/docs/skylark/lib/dict.html">Dictionary: String -> String</a> | optional | {"dbg": "0", "fastbuild": "0", "opt": "3"} |
 | <a id="rust_toolchain-os"></a>os |  The operating system for the current toolchain   | String | required |  |
 | <a id="rust_toolchain-rust_doc"></a>rust_doc |  The location of the <code>rustdoc</code> binary. Can be a direct source or a filegroup containing one item.   | <a href="https://bazel.build/docs/build-ref.html#labels">Label</a> | optional | None |
-| <a id="rust_toolchain-rust_lib"></a>rust_lib |  The rust standard library.   | <a href="https://bazel.build/docs/build-ref.html#labels">Label</a> | optional | None |
+| <a id="rust_toolchain-rust_lib"></a>rust_lib |  **Deprecated**: Use <code>rust_std</code>   | <a href="https://bazel.build/docs/build-ref.html#labels">Label</a> | optional | None |
+| <a id="rust_toolchain-rust_std"></a>rust_std |  The Rust standard library.   | <a href="https://bazel.build/docs/build-ref.html#labels">Label</a> | optional | None |
 | <a id="rust_toolchain-rustc"></a>rustc |  The location of the <code>rustc</code> binary. Can be a direct source or a filegroup containing one item.   | <a href="https://bazel.build/docs/build-ref.html#labels">Label</a> | optional | None |
 | <a id="rust_toolchain-rustc_lib"></a>rustc_lib |  The libraries used by rustc during compilation.   | <a href="https://bazel.build/docs/build-ref.html#labels">Label</a> | optional | None |
 | <a id="rust_toolchain-rustc_srcs"></a>rustc_srcs |  The source code of rustc.   | <a href="https://bazel.build/docs/build-ref.html#labels">Label</a> | optional | None |
 | <a id="rust_toolchain-rustfmt"></a>rustfmt |  The location of the <code>rustfmt</code> binary. Can be a direct source or a filegroup containing one item.   | <a href="https://bazel.build/docs/build-ref.html#labels">Label</a> | optional | None |
 | <a id="rust_toolchain-staticlib_ext"></a>staticlib_ext |  The extension for static libraries created from rustc.   | String | required |  |
-| <a id="rust_toolchain-stdlib_linkflags"></a>stdlib_linkflags |  Additional linker flags to use when Rust std lib is linked by a C++ linker (rustc will deal with these automatically). Subject to location expansion with respect to the srcs of the rust_lib attribute.   | List of strings | required |  |
+| <a id="rust_toolchain-stdlib_linkflags"></a>stdlib_linkflags |  Additional linker flags to use when Rust standard library is linked by a C++ linker (rustc will deal with these automatically). Subject to location expansion with respect to the srcs of the <code>rust_std</code> attribute.   | List of strings | required |  |
 | <a id="rust_toolchain-target_json"></a>target_json |  Override the target_triple with a custom target specification. For more details see: https://doc.rust-lang.org/rustc/targets/custom.html   | <a href="https://bazel.build/docs/build-ref.html#labels">Label</a> | optional | None |
 | <a id="rust_toolchain-target_triple"></a>target_triple |  The platform triple for the toolchains target environment. For more details see: https://docs.bazel.build/versions/master/skylark/rules.html#configurations   | String | optional | "" |
 
diff --git a/rust/private/repository_utils.bzl b/rust/private/repository_utils.bzl
index 822c932..a5f0a5a 100644
--- a/rust/private/repository_utils.bzl
+++ b/rust/private/repository_utils.bzl
@@ -141,7 +141,7 @@
 load("@rules_rust//rust:toolchain.bzl", "rust_stdlib_filegroup")
 
 rust_stdlib_filegroup(
-    name = "rust_lib-{target_triple}",
+    name = "rust_std-{target_triple}",
     srcs = glob(
         [
             "lib/rustlib/{target_triple}/lib/*.rlib",
@@ -154,6 +154,13 @@
     ),
     visibility = ["//visibility:public"],
 )
+
+# For legacy support
+alias(
+    name = "rust_lib-{target_triple}",
+    actual = "rust_std-{target_triple}",
+    visibility = ["//visibility:public"],
+)
 """
 
 def BUILD_for_stdlib(target_triple):
@@ -177,7 +184,7 @@
 rust_toolchain(
     name = "{toolchain_name}_impl",
     rust_doc = "@{workspace_name}//:rustdoc",
-    rust_lib = "@{workspace_name}//:rust_lib-{target_triple}",
+    rust_std = "@{workspace_name}//:rust_std-{target_triple}",
     rustc = "@{workspace_name}//:rustc",
     rustfmt = "@{workspace_name}//:rustfmt_bin",
     cargo = "@{workspace_name}//:cargo",
diff --git a/rust/private/rustc.bzl b/rust/private/rustc.bzl
index beb72b0..440c26b 100644
--- a/rust/private/rustc.bzl
+++ b/rust/private/rustc.bzl
@@ -409,7 +409,7 @@
         ([] if linker_script == None else [linker_script]),
         transitive = [
             toolchain.rustc_lib.files,
-            toolchain.rust_lib.files,
+            toolchain.rust_std.files,
             linker_depset,
             crate_info.srcs,
             dep_info.transitive_crate_outputs,
@@ -617,10 +617,10 @@
         rustc_flags.add(linker_script.path, format = "--codegen=link-arg=-T%s")
 
     # Gets the paths to the folders containing the standard library (or libcore)
-    rust_lib_paths = depset([file.dirname for file in toolchain.rust_lib.files.to_list()]).to_list()
+    rust_std_paths = depset([file.dirname for file in toolchain.rust_std.files.to_list()]).to_list()
 
     # Tell Rustc where to find the standard library
-    rustc_flags.add_all(rust_lib_paths, before_each = "-L", format_each = "%s")
+    rustc_flags.add_all(rust_std_paths, before_each = "-L", format_each = "%s")
     rustc_flags.add_all(rust_flags)
 
     data_paths = getattr(attr, "data", []) + getattr(attr, "compile_data", [])
@@ -674,8 +674,8 @@
         data_paths,
     ))
 
-    # Set the SYSROOT to the directory of the rust_lib files passed to the toolchain
-    env["SYSROOT"] = paths.dirname(toolchain.rust_lib.files.to_list()[0].short_path)
+    # Set the SYSROOT to the directory of the rust_std files passed to the toolchain
+    env["SYSROOT"] = paths.dirname(toolchain.rust_std.files.to_list()[0].short_path)
 
     # extra_rustc_flags apply to the target configuration, not the exec configuration.
     if hasattr(ctx.attr, "_extra_rustc_flags") and is_exec_configuration(ctx):
diff --git a/rust/private/toolchain_utils.bzl b/rust/private/toolchain_utils.bzl
index aa98a43..9e011be 100644
--- a/rust/private/toolchain_utils.bzl
+++ b/rust/private/toolchain_utils.bzl
@@ -9,7 +9,7 @@
     Returns:
         str: A path assignable as `SYSROOT` for an action.
     """
-    sysroot_anchor = rust_toolchain.rust_lib.files.to_list()[0]
+    sysroot_anchor = rust_toolchain.rust_std.files.to_list()[0]
     directory = sysroot_anchor.path.split(sysroot_anchor.short_path, 1)[0]
     return directory.rstrip("/")
 
@@ -57,8 +57,8 @@
         files = toolchain.rustc_lib.files
     elif ctx.attr.tool == "rustc_srcs":
         files = toolchain.rustc_srcs.files
-    elif ctx.attr.tool == "rust_lib" or ctx.attr.tool == "rust_stdlib":
-        files = toolchain.rust_lib.files
+    elif ctx.attr.tool == "rust_std" or ctx.attr.tool == "rust_stdlib" or ctx.attr.tool == "rust_lib":
+        files = toolchain.rust_std.files
     else:
         fail("Unsupported tool: ", ctx.attr.tool)
 
@@ -76,13 +76,14 @@
             values = [
                 "cargo",
                 "clippy",
+                "rust_lib",
+                "rust_std",
+                "rust_stdlib",
+                "rustc_lib",
+                "rustc_srcs",
                 "rustc",
                 "rustdoc",
                 "rustfmt",
-                "rustc_lib",
-                "rustc_srcs",
-                "rust_lib",
-                "rust_stdlib",
             ],
             mandatory = True,
         ),
diff --git a/rust/toolchain.bzl b/rust/toolchain.bzl
index 868f28d..3785b2e 100644
--- a/rust/toolchain.bzl
+++ b/rust/toolchain.bzl
@@ -6,7 +6,7 @@
 load("//rust/settings:incompatible.bzl", "IncompatibleFlagInfo")
 
 def _rust_stdlib_filegroup_impl(ctx):
-    rust_lib = ctx.files.srcs
+    rust_std = ctx.files.srcs
     dot_a_files = []
     between_alloc_and_core_files = []
     core_files = []
@@ -15,11 +15,11 @@
     alloc_files = []
     self_contained_files = [
         file
-        for file in rust_lib
+        for file in rust_std
         if file.basename.endswith(".o") and "self-contained" in file.path
     ]
 
-    std_rlibs = [f for f in rust_lib if f.basename.endswith(".rlib")]
+    std_rlibs = [f for f in rust_std if f.basename.endswith(".rlib")]
     if std_rlibs:
         # std depends on everything
         #
@@ -46,7 +46,7 @@
             for f in sorted(partitioned):
                 # buildifier: disable=print
                 print("File partitioned: {}".format(f.basename))
-            fail("rust_toolchain couldn't properly partition rlibs in rust_lib. Partitioned {} out of {} files. This is probably a bug in the rule implementation.".format(partitioned_files_len, len(dot_a_files)))
+            fail("rust_toolchain couldn't properly partition rlibs in rust_std. Partitioned {} out of {} files. This is probably a bug in the rule implementation.".format(partitioned_files_len, len(dot_a_files)))
 
     return [
         DefaultInfo(
@@ -97,12 +97,12 @@
         pic_static_library = library,
     )
 
-def _make_libstd_and_allocator_ccinfo(ctx, rust_lib, allocator_library):
+def _make_libstd_and_allocator_ccinfo(ctx, rust_std, allocator_library):
     """Make the CcInfo (if possible) for libstd and allocator libraries.
 
     Args:
         ctx (ctx): The rule's context object.
-        rust_lib: The rust standard library.
+        rust_std: The Rust standard library.
         allocator_library: The target to use for providing allocator functions.
 
 
@@ -112,14 +112,14 @@
     cc_toolchain, feature_configuration = find_cc_toolchain(ctx)
     cc_infos = []
 
-    if not rust_common.stdlib_info in ctx.attr.rust_lib:
+    if not rust_common.stdlib_info in rust_std:
         fail(dedent("""\
             {} --
             The `rust_lib` ({}) must be a target providing `rust_common.stdlib_info`
             (typically `rust_stdlib_filegroup` rule from @rules_rust//rust:defs.bzl).
             See https://github.com/bazelbuild/rules_rust/pull/802 for more information.
-        """).format(ctx.label, ctx.attr.rust_lib))
-    rust_stdlib_info = ctx.attr.rust_lib[rust_common.stdlib_info]
+        """).format(ctx.label, rust_std))
+    rust_stdlib_info = rust_std[rust_common.stdlib_info]
 
     if rust_stdlib_info.self_contained_files:
         compilation_outputs = cc_common.create_compilation_outputs(
@@ -187,7 +187,7 @@
         )
 
         link_inputs = cc_common.create_linker_input(
-            owner = rust_lib.label,
+            owner = rust_std.label,
             libraries = std_inputs,
         )
 
@@ -237,12 +237,21 @@
     rename_first_party_crates = ctx.attr._rename_first_party_crates[BuildSettingInfo].value
     third_party_dir = ctx.attr._third_party_dir[BuildSettingInfo].value
 
+    if ctx.attr.rust_lib:
+        # buildifier: disable=print
+        print("`rust_toolchain.rust_lib` is deprecated. Please update {} to use `rust_toolchain.rust_std`".format(
+            ctx.label,
+        ))
+        rust_std = ctx.attr.rust_lib
+    else:
+        rust_std = ctx.attr.rust_std
+
     expanded_stdlib_linkflags = []
     for flag in ctx.attr.stdlib_linkflags:
         expanded_stdlib_linkflags.append(
             ctx.expand_location(
                 flag,
-                targets = ctx.attr.rust_lib[rust_common.stdlib_info].srcs,
+                targets = rust_std[rust_common.stdlib_info].srcs,
             ),
         )
 
@@ -269,7 +278,8 @@
         target_flag_value = ctx.file.target_json.path if ctx.file.target_json else ctx.attr.target_triple,
         rustc_lib = ctx.attr.rustc_lib,
         rustc_srcs = ctx.attr.rustc_srcs,
-        rust_lib = ctx.attr.rust_lib,
+        rust_std = rust_std,
+        rust_lib = rust_std,  # `rust_lib` is deprecated and only exists for legacy support.
         binary_ext = ctx.attr.binary_ext,
         staticlib_ext = ctx.attr.staticlib_ext,
         dylib_ext = ctx.attr.dylib_ext,
@@ -286,7 +296,7 @@
         default_edition = ctx.attr.default_edition,
         compilation_mode_opts = compilation_mode_opts,
         crosstool_files = ctx.files._crosstool,
-        libstd_and_allocator_ccinfo = _make_libstd_and_allocator_ccinfo(ctx, ctx.attr.rust_lib, ctx.attr.allocator_library),
+        libstd_and_allocator_ccinfo = _make_libstd_and_allocator_ccinfo(ctx, rust_std, ctx.attr.allocator_library),
         _incompatible_remove_transitive_libs_from_dep_info = remove_transitive_libs_from_dep_info.enabled,
         _rename_first_party_crates = rename_first_party_crates,
         _third_party_dir = third_party_dir,
@@ -354,7 +364,10 @@
             cfg = "exec",
         ),
         "rust_lib": attr.label(
-            doc = "The rust standard library.",
+            doc = "**Deprecated**: Use `rust_std`",
+        ),
+        "rust_std": attr.label(
+            doc = "The Rust standard library.",
         ),
         "rustc": attr.label(
             doc = "The location of the `rustc` binary. Can be a direct source or a filegroup containing one item.",
@@ -379,9 +392,9 @@
         ),
         "stdlib_linkflags": attr.string_list(
             doc = (
-                "Additional linker flags to use when Rust std lib is linked by a C++ linker " +
-                "(rustc will deal with these automatically). " +
-                "Subject to location expansion with respect to the srcs of the rust_lib attribute."
+                "Additional linker flags to use when Rust standard library is linked by a C++ linker " +
+                "(rustc will deal with these automatically). Subject to location expansion with respect " +
+                "to the srcs of the `rust_std` attribute."
             ),
             mandatory = True,
         ),
@@ -432,7 +445,7 @@
     name = "rust_cpuX_impl",
     rustc = "@rust_cpuX//:rustc",
     rustc_lib = "@rust_cpuX//:rustc_lib",
-    rust_lib = "@rust_cpuX//:rust_lib",
+    rust_std = "@rust_cpuX//:rust_std",
     rust_doc = "@rust_cpuX//:rustdoc",
     binary_ext = "",
     staticlib_ext = ".a",
diff --git a/test/unit/toolchain/toolchain_test.bzl b/test/unit/toolchain/toolchain_test.bzl
index 8f476a6..917e7d0 100644
--- a/test/unit/toolchain/toolchain_test.bzl
+++ b/test/unit/toolchain/toolchain_test.bzl
@@ -59,7 +59,7 @@
         binary_ext = "",
         dylib_ext = ".so",
         os = "linux",
-        rust_lib = ":std_libs",
+        rust_std = ":std_libs",
         staticlib_ext = ".a",
         stdlib_linkflags = [],
         target_triple = "toolchain-test-triple",
@@ -70,7 +70,7 @@
         binary_ext = "",
         dylib_ext = ".so",
         os = "linux",
-        rust_lib = ":std_libs",
+        rust_std = ":std_libs",
         staticlib_ext = ".a",
         stdlib_linkflags = [],
         target_json = ":target_json",
@@ -81,7 +81,7 @@
         binary_ext = "",
         dylib_ext = ".so",
         os = "linux",
-        rust_lib = ":std_libs",
+        rust_std = ":std_libs",
         staticlib_ext = ".a",
         stdlib_linkflags = ["test:$(location :stdlib_srcs)"],
         target_json = ":target_json",