From 3fc625de3f58c86c902e0f2cbc91b17e66f056fc Mon Sep 17 00:00:00 2001
From: Michael Miller <icy.arctic.fox@gmail.com>
Date: Wed, 12 Sep 2018 18:54:46 -0600
Subject: [PATCH] Allow generic types for #described_class and implicit
 #subject

Add runtime check to ensure #described_class is a type name.
---
 src/spectator/dsl.cr | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/spectator/dsl.cr b/src/spectator/dsl.cr
index a6041f7..080a15e 100644
--- a/src/spectator/dsl.cr
+++ b/src/spectator/dsl.cr
@@ -27,9 +27,12 @@ module Spectator
         module Locals
           include {{parent_module}}::Locals
 
-          {% if what.is_a?(Path) %}
+          {% if what.is_a?(Path) || what.is_a?(Generic) %}
             def described_class
-              {{what}}
+              {{what}}.tap do |thing|
+                raise "#{thing} must be a type name to use #described_class or #subject,\
+                 but it is a #{typeof(thing)}" unless thing.is_a?(Class)
+              end
             end
 
             def subject