ImplicitStringConcatenation behaves differently with ParserEngine: parser_prism

[andyw8]

Expected behavior

I'm not sure 100% sure what the correct behaviour is.

Actual behavior

Given this code:

<<~MESSAGE
  \n
  a
MESSAGE

The regular parser allows it, but with parser_prism it fails with:

Combine and "a\n" into a single string literal, rather than using implicit string concatenation.

RuboCop version

1.63.1 (using Prism 0.24.0, rubocop-ast 1.31.2, running on ruby 3.3.0) [x86_64-linux]
  - rubocop-graphql 1.5.1
  - rubocop-minitest 0.35.0
  - rubocop-performance 1.21.0
  - rubocop-rails 2.24.1
  - rubocop-sorbet 0.8.1

[andyw8]

Possibly related: ruby/prism#2668