[PRISM] Fix bugs in compiling optional keyword parameters

This PR fixes two bugs when compiling optional keyword parameters:
- It moves keyword parameter compilation to STEP 5 in the parameters
sequence, where the rest of compilation happens. This is important
because keyword parameter compilation relies on the value of
body->param.keyword->bits_start which gets set in an earlier step
- It compiles array and hash values for keyword parameters, which
it didn't previously

1 files changed, 6 insertions, 0 deletions

diff --git a/test/ruby/test_compile_prism.rb b/test/ruby/test_compile_prism.rb
index 7bd63eb611..f89aabfc0e 100644
--- a/test/ruby/test_compile_prism.rb
+++ b/test/ruby/test_compile_prism.rb
@@ -1178,6 +1178,12 @@ module Prism
         end
         prism_test_def_node(10, b: 3)
       CODE
+      assert_prism_eval(<<-CODE)
+        def self.prism_test_def_node(a: [])
+          a
+        end
+        prism_test_def_node
+      CODE
 
       # block arguments
       assert_prism_eval("def self.prism_test_def_node(&block) block end; prism_test_def_node{}.class")