Add example with a non-workspace Cargo.toml (#3019)

We don't currently have any examples that show that this works, and I'm
currently debugging an edge-case where it doesn't, so I'd like a little
extra coverage.

.bazelci/presubmit.yml

@@ -723,7 +723,7 @@ tasks:
     working_directory: examples/bzlmod/hello_world
     test_flags: *bzlmod_flags
     run_targets:
-      - "//third-party:vendor"
+      - "//third-party-in-workspace:vendor"
       - "@rules_rust//tools/rust_analyzer:gen_rust_project"
     test_targets:
       - "//..."
@@ -735,7 +735,7 @@ tasks:
     shell_commands:
       - "rm MODULE.bazel.lock"
     run_targets:
-      - "//third-party:vendor"
+      - "//third-party-in-workspace:vendor"
       - "@rules_rust//tools/rust_analyzer:gen_rust_project"
     test_targets:
       - "//..."
@@ -745,7 +745,7 @@ tasks:
     working_directory: examples/bzlmod/hello_world
     test_flags: *bzlmod_flags
     run_targets:
-      - "//third-party:vendor"
+      - "//third-party-in-workspace:vendor"
       - "@rules_rust//tools/rust_analyzer:gen_rust_project"
     test_targets:
       - "//..."
@@ -756,7 +756,7 @@ tasks:
   #   working_directory: examples/bzlmod/hello_world
   #   test_flags: *bzlmod_flags
   #   run_targets:
-  #     - "//third-party:vendor"
+  #     - "//third-party-in-workspace:vendor"
   #   build_targets:
   #     - "@rules_rust//tools/rust_analyzer:gen_rust_project"
   #   test_targets:
@@ -770,7 +770,7 @@ tasks:
     working_directory: examples/bzlmod/hello_world
     test_flags: *bzlmod_plus_repo_names_flags
     run_targets:
-      - "//third-party:vendor"
+      - "//third-party-in-workspace:vendor"
       - "@rules_rust//tools/rust_analyzer:gen_rust_project"
     test_targets:
       - "//..."
@@ -783,7 +783,7 @@ tasks:
     working_directory: examples/bzlmod/hello_world
     test_flags: *bzlmod_plus_repo_names_flags
     run_targets:
-      - "//third-party:vendor"
+      - "//third-party-in-workspace:vendor"
       - "@rules_rust//tools/rust_analyzer:gen_rust_project"
     test_targets:
       - "//..."
@@ -796,7 +796,7 @@ tasks:
     working_directory: examples/bzlmod/hello_world
     test_flags: *bzlmod_plus_repo_names_flags
     run_targets:
-      - "//third-party:vendor"
+      - "//third-party-in-workspace:vendor"
     build_targets:
       - "@rules_rust//tools/rust_analyzer:gen_rust_project"
     test_targets:

.bcr/presubmit.yml

@@ -13,7 +13,7 @@ bcr_test_module:
       shell_commands:
         - "rm MODULE.bazel.lock"
       run_targets:
-        - "//third-party:vendor"
+        - "//third-party-in-workspace:vendor"
         - "@rules_rust//tools/rust_analyzer:gen_rust_project"
       test_targets:
         - "//..."
@@ -32,7 +32,7 @@ bcr_test_module_windows:
       shell_commands:
         - "rm MODULE.bazel.lock"
       run_targets:
-        - "//third-party:vendor"
+        - "//third-party-in-workspace:vendor"
       build_targets:
         - "@rules_rust//tools/rust_analyzer:gen_rust_project"
       test_targets:

examples/bzlmod/hello_world/BUILD.bazel

@@ -4,18 +4,26 @@ load("@rules_rust//rust:defs.bzl", "rust_binary", "rust_doc")
 package(default_visibility = ["//visibility:public"])
 
 rust_binary(
-    name = "hello_world_transient",
+    name = "hello_world_from_workspace_transient",
     srcs = ["src/main.rs"],
     deps = [
-        "@crates//:anyhow",
+        "@crates_in_workspace//:anyhow",
     ],
 )
 
 rust_binary(
-    name = "hello_world_vendored",
+    name = "hello_world_from_workspace_vendored",
     srcs = ["src/main.rs"],
     deps = [
-        "//third-party/crates:anyhow",
+        "//third-party-in-workspace/crates:anyhow",
+    ],
+)
+
+rust_binary(
+    name = "hello_world_without_workspace_transient",
+    srcs = ["src/main.rs"],
+    deps = [
+        "@crates_without_workspace//:anyhow",
     ],
 )
 
@@ -25,8 +33,9 @@ rust_binary(
         crate = ":hello_world_{}".format(target),
     )
     for target in [
-        "transient",
-        "vendored",
+        "from_workspace_transient",
+        "from_workspace_vendored",
+        "without_workspace_transient",
     ]
 ]
 
@@ -45,8 +54,9 @@ rust_binary(
         ],
     )
     for target in [
-        "transient",
-        "vendored",
+        "from_workspace_transient",
+        "from_workspace_vendored",
+        "without_workspace_transient",
     ]
 ]
 

examples/bzlmod/hello_world/MODULE.bazel

@@ -27,23 +27,34 @@ crate = use_extension(
     "crate",
 )
 crate.from_cargo(
-    name = "crates",
-    cargo_lockfile = "//third-party:Cargo.lock",
-    manifests = ["//third-party:Cargo.toml"],
+    name = "crates_in_workspace",
+    cargo_lockfile = "//third-party-in-workspace:Cargo.lock",
+    manifests = ["//third-party-in-workspace:Cargo.toml"],
 )
-use_repo(crate, "crates")
+use_repo(crate, "crates_in_workspace")
 crate.annotation(
     additive_build_file = "//:BUILD.anyhow.bazel",
     crate = "anyhow",
     # Defined in additive_build_file.
     data = [":cargo_toml"],
     # Optional, you probably don't need this. Defaults to all from_cargo
     # invocations in this module.
-    repositories = ["crates"],
+    repositories = [
+        "crates_in_workspace",
+        "crates_without_workspace",
+    ],
     # Optional, you probably don't need this, defaults to "*".
     version = "*",
 )
 
 # Option 2: Vendored crates
-crate_repositories = use_extension("//third-party:extension.bzl", "crate_repositories")
+crate_repositories = use_extension("//third-party-in-workspace:extension.bzl", "crate_repositories")
 use_repo(crate_repositories, "vendor__anyhow-1.0.77")
+
+# Another example of Option 1, but where the Cargo.toml file isn't a [workspace]
+crate.from_cargo(
+    name = "crates_without_workspace",
+    cargo_lockfile = "//third-party-without-workspace:Cargo.lock",
+    manifests = ["//third-party-without-workspace:Cargo.toml"],
+)
+use_repo(crate, "crates_without_workspace")