Fix for ImplicitRestNode

Author: tompng

lib/repl_type_completor/type_analyzer.rb

@@ -923,8 +923,7 @@ def assign_parameters(node, scope, args, kwargs)
       node.posts.zip posts do |n, v|
         assign_required_parameter n, v, scope
       end
-      if node.rest&.name
-        # node.rest is Prism::RestParameterNode
+      if node.rest.is_a?(Prism::RestParameterNode) && node.rest.name
         scope[node.rest.name.to_s] = Types.array_of(*rest)
       end
       node.keywords.each do |n|

test/repl_type_completor/test_type_analyze.rb

@@ -681,6 +681,7 @@ def test_call_parameter
 
     def test_block_args
       assert_call('[1,2,3].tap{|a| a.', include: Array)
+      assert_call('[1,2,3].tap{|a,| a.', include: Integer)
       assert_call('[1,2,3].tap{|a,b| a.', include: Integer)
       assert_call('[1,2,3].tap{|(a,b)| a.', include: Integer)
       assert_call('[1,2,3].tap{|a,*b| b.', include: Array)