Validate also custom rust-client.channel values, e.g. 1.39.0

Author: Xanewok

CHANGELOG.md

@@ -1,5 +1,6 @@
 ### Unreleased
 
+* Don't warn on custom `rust-client.channel` value such as `1.39.0` in properties.json
 * Add a new `default` value for `rust-client.channel` (same as setting it explicitly to `null`)
 * Add a self-closing angular (`>`) bracket whenever opening one (`<`) has been typed
 * Refresh the RLS spinner 🌕

package.json

@@ -193,17 +193,27 @@
                     "description": "Disable usage of rustup and use rustc/rls from PATH."
                 },
                 "rust-client.channel": {
-                    "type": [
-                        "string",
-                        "null"
+                    "anyOf": [
+                        {
+                            "type": "string"
+                        },
+                        {
+                            "type": "string",
+                            "enum": [
+                                "default",
+                                "stable",
+                                "beta",
+                                "nightly"
+                            ],
+                            "enumDescriptions": [
+                                "Uses the same channel as your currently open project",
+                                "Explicitly use the `stable` channel",
+                                "Explicitly use the `beta` channel",
+                                "Explicitly use the `nightly` channel"
+                            ]
+                        }
                     ],
-                    "enum": [
-                        "default",
-                        "stable",
-                        "beta",
-                        "nightly"
-                    ],
-                    "default": null,
+                    "default": "default",
                     "description": "Rust channel to invoke rustup with. Ignored if rustup is disabled. By default, uses the same channel as your currently open project."
                 },
                 "rust-client.trace.server": {