fix: bug with aliasing core tools (#3395)

Fixes #3324

e2e/config/test_config_alias

@@ -3,13 +3,15 @@
 cat <<EOF >mise.toml
 tools.erlang = "1.0.0-erlang"
 tools.node = "1.0.0-node"
+tools.corenode = "22.0.0"
 tools.python = "1.0.0-python"
 tools.mytool = "2"
 tools.mytool-lts = "lts"
 
 [alias]
 erlang = 'asdf:https://github.com/jdx/mise-tiny'
 node = "asdf:tiny"
+corenode = "core:node"
 python = 'asdf:jdx/mise-tiny'
 mytool = "asdf:tiny"
 [alias.mytool-lts]
@@ -19,6 +21,7 @@ EOF
 
 assert_contains "mise x erlang -- mise-tiny" "mise-tiny: v1.0.0-erlang"
 assert_contains "mise x node -- rtx-tiny" "rtx-tiny: v1.0.0-node"
+assert_contains "mise x corenode -- node -v" "v22.0.0"
 assert_contains "mise x python -- mise-tiny" "mise-tiny: v1.0.0-python"
 assert_contains "mise x mytool -- rtx-tiny" "rtx-tiny: v2.1.0"
 assert_contains "mise x mytool-lts -- rtx-tiny" "rtx-tiny: v1.0.1"

src/backend/mod.rs

@@ -116,7 +116,17 @@ pub fn remove(short: &str) {
 
 pub fn arg_to_backend(ba: BackendArg) -> Option<ABackend> {
     match ba.backend_type() {
-        BackendType::Core => CORE_PLUGINS.get(&ba.short).cloned(),
+        BackendType::Core => {
+            CORE_PLUGINS
+                .get(&ba.short)
+                .or_else(|| {
+                    // this can happen if something like "corenode" is aliased to "core:node"
+                    ba.full()
+                        .strip_prefix("core:")
+                        .and_then(|short| CORE_PLUGINS.get(short))
+                })
+                .cloned()
+        }
         BackendType::Aqua => Some(Arc::new(aqua::AquaBackend::from_arg(ba))),
         BackendType::Asdf => Some(Arc::new(asdf::AsdfBackend::from_arg(ba))),
         BackendType::Cargo => Some(Arc::new(cargo::CargoBackend::from_arg(ba))),