Fix up ruby_parser interpolation concatenation

Author: kddnewton

lib/prism/translation/ruby_parser.rb

@@ -905,8 +905,13 @@ def visit_interpolated_x_string_node(node)
  results << result
  state = :interpolated_content
  end
- else
- results << result
+ when :interpolated_content
+ if result.is_a?(Array) && result[0] == :str && results[-1][0] == :str && (results[-1].line_max == result.line)
+ results[-1][1] << result[1]
+ results[-1].line_max = result.line_max
+ else
+ results << result
+ end
  end
  end
  end

test/prism/ruby_parser_test.rb

@@ -28,19 +28,15 @@ class RubyParserTest < TestCase
  base = File.join(__dir__, "fixtures")
 
  todos = %w[
- heredocs_nested.txt
  newline_terminated.txt
  regex_char_width.txt
  seattlerb/bug169.txt
- seattlerb/dstr_evstr.txt
- seattlerb/heredoc_squiggly_interp.txt
  seattlerb/masgn_colon3.txt
  seattlerb/messy_op_asgn_lineno.txt
  seattlerb/op_asgn_primary_colon_const_command_call.txt
  seattlerb/parse_line_evstr_after_break.txt
  seattlerb/regexp_esc_C_slash.txt
  seattlerb/str_lit_concat_bad_encodings.txt
- seattlerb/str_pct_nested_nested.txt
  unescaping.txt
  unparser/corpus/literal/kwbegin.txt
  unparser/corpus/literal/send.txt
@@ -76,12 +72,10 @@ class RubyParserTest < TestCase
  tilde_heredocs.txt
  unparser/corpus/literal/literal.txt
  while.txt
- whitequark/class_definition_in_while_cond.txt
  whitequark/cond_eflipflop.txt
  whitequark/cond_iflipflop.txt
  whitequark/cond_match_current_line.txt
  whitequark/dedenting_heredoc.txt
- whitequark/if_while_after_class__since_32.txt
  whitequark/lvar_injecting_match.txt
  whitequark/not.txt
  whitequark/numparam_ruby_bug_19025.txt