[ruby/prism] Remove now-defunct semantic_field from nodes

https://github.com/ruby/prism/commit/c82a9dad64

prism/config.yml

@@ -1772,7 +1772,6 @@ nodes:
         type: location
       - name: content_loc
         type: location
-        semantic_field: true # https://github.com/ruby/prism/issues/1452
       - name: closing_loc
         type: location
       - name: unescaped
@@ -2093,7 +2092,6 @@ nodes:
         type: location
       - name: content_loc
         type: location
-        semantic_field: true # https://github.com/ruby/prism/issues/1452
       - name: closing_loc
         type: location
       - name: unescaped
@@ -2287,10 +2285,8 @@ nodes:
         kind: StringFlags
       - name: opening_loc
         type: location?
-        semantic_field: true # https://github.com/ruby/prism/issues/1452
       - name: content_loc
         type: location
-        semantic_field: true # https://github.com/ruby/prism/issues/1452
       - name: closing_loc
         type: location?
       - name: unescaped

prism/prism.c

@@ -6370,16 +6370,8 @@ escape_read(pm_parser_t *parser, pm_buffer_t *buffer, uint8_t flags) {
                         extra_codepoints_start = unicode_start;
                     }
 
+                    if (!(flags & PM_ESCAPE_FLAG_REGEXP)) {
                         uint32_t value = escape_unicode(unicode_start, hexadecimal_length);
-
-                    if (flags & PM_ESCAPE_FLAG_REGEXP) {
-                        if (codepoints_count == 1) {
-                            pm_buffer_append_bytes(buffer, (const uint8_t *) "\\u{", 3);
-                        } else {
-                            pm_buffer_append_u8(buffer, ' ');
-                        }
-                        pm_buffer_append_bytes(buffer, unicode_start, hexadecimal_length);
-                    } else {
                         escape_write_unicode(parser, buffer, unicode_start, parser->current.end, value);
                     }
 
@@ -6393,13 +6385,13 @@ escape_read(pm_parser_t *parser, pm_buffer_t *buffer, uint8_t flags) {
 
                 if (peek(parser) == '}') {
                     parser->current.end++;
-
-                    if (flags & PM_ESCAPE_FLAG_REGEXP) {
-                        pm_buffer_append_u8(buffer, '}');
-                    }
                 } else {
                     pm_parser_err(parser, unicode_codepoints_start, parser->current.end, PM_ERR_ESCAPE_INVALID_UNICODE_TERM);
                 }
+
+                if (flags & PM_ESCAPE_FLAG_REGEXP) {
+                    pm_buffer_append_bytes(buffer, unicode_codepoints_start, (size_t) (parser->current.end - unicode_codepoints_start));
+                }
             } else {
                 pm_parser_err_current(parser, PM_ERR_ESCAPE_INVALID_UNICODE);
             }
@@ -6508,6 +6500,7 @@ escape_read(pm_parser_t *parser, pm_buffer_t *buffer, uint8_t flags) {
                 return;
             }
         }
+        /* fallthrough */
         default: {
             if (parser->current.end < parser->end) {
                 pm_buffer_append_u8(buffer, *parser->current.end++);

prism/templates/template.rb

@@ -136,7 +136,7 @@ module Prism
   # This represents a field on a node that is a location.
   class LocationField < Field
     def semantic_field?
-      options[:semantic_field] || false
+      false
     end
 
     def rbs_class
@@ -151,7 +151,7 @@ module Prism
   # This represents a field on a node that is a location that is optional.
   class OptionalLocationField < Field
     def semantic_field?
-      options[:semantic_field] || false
+      false
     end
 
     def rbs_class

test/prism/unescape_test.rb

@@ -162,8 +162,12 @@ module Prism
       # \u0000 \u0001 \u0002 ...
       assert_unescape(context, "u#{["5"].concat(hex.sample(3)).join}")
 
+      # The behavior of whitespace in the middle of these escape sequences
+      # changed in Ruby 3.3.0, so we only want to test against latest.
+      if RUBY_VERSION >= "3.3.0"
         # \u{00  00} ...
         assert_unescape(context, "u{00#{["5"].concat(hex.sample(3)).join} \t\v 00#{["5"].concat(hex.sample(3)).join}}")
+      end
 
       (0...128).each do |ord|
         chr = ord.chr