Switch the default parser from parse.y to Prism

This commit switches the default parser to Prism. There are a
couple of additional changes related to this that are a part of
this as well to make this happen.

* Switch the default parser in parse.h
* Remove the Prism-specific workflow and add a parse.y-specific
  workflow to CI so that it continues to be tested
* Update a few test exclusions since Prism has the correct
  behavior but parse.y doesn't per
  https://bugs.ruby-lang.org/issues/20504.
* Skips a couple of tests on RBS which are failing because they
  are using RubyVM::AbstractSyntaxTree.of.

Fixes [Feature #20564]

3 files changed, 8 insertions, 7 deletions

diff --git a/test/ruby/test_literal.rb b/test/ruby/test_literal.rb
index 8732d8f0d0..9b294bc8ea 100644
--- a/test/ruby/test_literal.rb
+++ b/test/ruby/test_literal.rb
@@ -241,8 +241,9 @@ class TestRubyLiteral < Test::Unit::TestCase
   def test_dregexp
     assert_instance_of Regexp, /re#{'ge'}xp/
     assert_equal(/regexp/, /re#{'ge'}xp/)
-    bug3903 = '[ruby-core:32682]'
-    assert_raise(SyntaxError, bug3903) {eval('/[#{"\x80"}]/')}
+
+    # [ruby-core:32682]
+    eval('/[#{"\x80"}]/')
   end
 
   def test_array
diff --git a/test/ruby/test_m17n.rb b/test/ruby/test_m17n.rb
index 630ba269c0..93366ed02a 100644
--- a/test/ruby/test_m17n.rb
+++ b/test/ruby/test_m17n.rb
@@ -1439,20 +1439,20 @@ class TestM17N < Test::Unit::TestCase
     assert_regexp_usascii_literal('//', Encoding::US_ASCII)
     assert_regexp_usascii_literal('/#{ }/', Encoding::US_ASCII)
     assert_regexp_usascii_literal('/#{"a"}/', Encoding::US_ASCII)
-    assert_regexp_usascii_literal('/#{%q"\x80"}/', Encoding::ASCII_8BIT)
-    assert_regexp_usascii_literal('/#{"\x80"}/', nil, SyntaxError)
+    assert_regexp_usascii_literal('/#{%q"\x80"}/', Encoding::US_ASCII)
+    assert_regexp_usascii_literal('/#{"\x80"}/', Encoding::ASCII_8BIT)
 
     assert_regexp_usascii_literal('/a/', Encoding::US_ASCII)
     assert_regexp_usascii_literal('/a#{ }/', Encoding::US_ASCII)
     assert_regexp_usascii_literal('/a#{"a"}/', Encoding::US_ASCII)
     assert_regexp_usascii_literal('/a#{%q"\x80"}/', Encoding::ASCII_8BIT)
-    assert_regexp_usascii_literal('/a#{"\x80"}/', nil, SyntaxError)
+    assert_regexp_usascii_literal('/a#{"\x80"}/', Encoding::ASCII_8BIT)
 
     assert_regexp_usascii_literal('/\x80/', Encoding::ASCII_8BIT)
     assert_regexp_usascii_literal('/\x80#{ }/', Encoding::ASCII_8BIT)
     assert_regexp_usascii_literal('/\x80#{"a"}/', Encoding::ASCII_8BIT)
     assert_regexp_usascii_literal('/\x80#{%q"\x80"}/', Encoding::ASCII_8BIT)
-    assert_regexp_usascii_literal('/\x80#{"\x80"}/', nil, SyntaxError)
+    assert_regexp_usascii_literal('/\x80#{"\x80"}/', Encoding::ASCII_8BIT)
 
     assert_regexp_usascii_literal('/\u1234/', Encoding::UTF_8)
     assert_regexp_usascii_literal('/\u1234#{ }/', Encoding::UTF_8)
diff --git a/test/ruby/test_mixed_unicode_escapes.rb b/test/ruby/test_mixed_unicode_escapes.rb
index f0b4cc691f..a30b5c19f5 100644
--- a/test/ruby/test_mixed_unicode_escapes.rb
+++ b/test/ruby/test_mixed_unicode_escapes.rb
@@ -18,12 +18,12 @@ class TestMixedUnicodeEscape < Test::Unit::TestCase
     assert_raise(SyntaxError) { eval %q("\u{1234}�")}
 
     # also should not work for Regexp
-    assert_raise(SyntaxError) { eval %q(/#{"\u1234"}#{"�"}/)}
     assert_raise(RegexpError) { eval %q(/\u{1234}#{nil}�/)}
     assert_raise(RegexpError) { eval %q(/�#{nil}\u1234/)}
 
     # String interpolation turns into an expression and we get
     # a different kind of error, but we still can't mix these
+    assert_raise(Encoding::CompatibilityError) { eval %q(/#{"\u1234"}#{"�"}/)}
     assert_raise(Encoding::CompatibilityError) { eval %q("\u{1234}#{nil}�")}
     assert_raise(Encoding::CompatibilityError) { eval %q("�#{nil}\u1234")}
   end