patch so core path is recognized

internal/shop.cm

@@ -143,8 +143,22 @@ function abs_path_to_package(package_dir)
 {
   if (!fd.is_file(package_dir + '/cell.toml'))
     throw new Error('Not a valid package directory (no cell.toml): ' + package_dir)
-  
+
   var packages_prefix = get_packages_dir() + '/'
+  var core_dir = packages_prefix + core_package
+
+  // Check if this is the core package directory (or its symlink target)
+  if (package_dir == core_dir) {
+    return 'core'
+  }
+  // Also check if core_dir is a symlink pointing to package_dir
+  if (fd.is_link(core_dir)) {
+    var core_target = fd.readlink(core_dir)
+    if (core_target == package_dir || fd.realpath(core_dir) == package_dir) {
+      return 'core'
+    }
+  }
+
   if (package_dir.startsWith(packages_prefix))
     return package_dir.substring(packages_prefix.length)
 
@@ -475,7 +489,10 @@ function resolve_locator(path, ctx)
 
   if (fd.is_file(ctx_path)) {
     var fn = resolve_mod_fn(ctx_path, ctx)
-    return {path: ctx_path, scope: SCOPE_LOCAL, symbol: fn}
+    // Check if ctx is the core package (either by name or by path)
+    var is_core = (ctx == 'core') || (ctx_dir == Shop.get_core_dir())
+    var scope = is_core ? SCOPE_CORE : SCOPE_LOCAL
+    return {path: ctx_path, scope: scope, symbol: fn}
   }
 
   if (is_internal_path(path))

internal/testlib.cm

@@ -0,0 +1,55 @@
+// Shared test/bench infrastructure
+var fd = use('fd')
+var pkg = use('package')
+
+// Check if current directory is a valid cell package
+function is_valid_package(dir) {
+  if (!dir) dir = '.'
+  return fd.is_file(dir + '/cell.toml')
+}
+
+// Get current package name from cell.toml or null
+function get_current_package_name() {
+  if (!is_valid_package('.')) return null
+  try {
+    var config = pkg.load_config(null)
+    return config.package || 'local'
+  } catch (e) {
+    return 'local'
+  }
+}
+
+// Get the directory for a package
+function get_pkg_dir(package_name) {
+  if (!package_name) {
+    return fd.realpath('.')
+  }
+  if (package_name.startsWith('/')) {
+    return package_name
+  }
+  var shop = use('internal/shop')
+  return shop.get_package_dir(package_name)
+}
+
+// Ensure directory exists
+function ensure_dir(path) {
+  if (fd.is_dir(path)) return true
+
+  var parts = path.split('/')
+  var current = path.startsWith('/') ? '/' : ''
+  for (var i = 0; i < parts.length; i++) {
+    if (parts[i] == '') continue
+    current += parts[i] + '/'
+    if (!fd.is_dir(current)) {
+      fd.mkdir(current)
+    }
+  }
+  return true
+}
+
+return {
+  is_valid_package: is_valid_package,
+  get_current_package_name: get_current_package_name,
+  get_pkg_dir: get_pkg_dir,
+  ensure_dir: ensure_dir
+}