[GR-18163] Ruby 2.7: Proc#<< and Proc#>> raises TypeError if passed n…

…ot callable object (#2164)

PullRequest: truffleruby/2186

CHANGELOG.md

@@ -23,6 +23,7 @@ Compatibility:
 * Implement `Complex#<=>` (#2004, @ssnickolay).
 * Add warning for `proc` without block (#2004, @ssnickolay).
 * Implemented `FrozenError#receiver`.
+* `Proc#<<` and `Proc#>>` raises TypeError if passed not callable object (#2004, @ssnickolay).
 
 Performance:
 

src/main/ruby/truffleruby/core/proc.rb

@@ -105,6 +105,8 @@ def to_proc
   end
 
   def >>(other)
+    raise(TypeError, 'callable object is expected') unless other.respond_to?(:call)
+
     if lambda?
       -> (*args, &block) do
         other.call(call(*args, &block))
@@ -117,6 +119,8 @@ def >>(other)
   end
 
   def <<(other)
+    raise(TypeError, 'callable object is expected') unless other.respond_to?(:call)
+
     if lambda?
       -> (*args, &block) do
         call(other.call(*args, &block))

test/mri/excludes/TestProc.rb

@@ -26,7 +26,6 @@
 exclude :test_proc_args_rest_post, "needs investigation"
 exclude :test_proc_args_rest_post_block, "needs investigation"
 exclude :test_safe, "needs investigation"
-exclude :test_compose_with_noncallable, "needs investigation"
 exclude :test_orphan_return, "needs investigation"
 exclude :test_proc_lambda, "needs investigation"
 exclude :test_proc_autosplat, "needs investigation"