Formatter fails with line continuation character before comment

[ThatsJustCheesy]

Hello again! I've run into a formatter issue.

This:

bug = \
  # blah
  nil

and this:

bug = \
  # blah
  puts(["hi"])

both trigger a crash in the formatter.

Output from first snippet

> crystal tool format --show-backtrace
expecting keyword nil, not `COMMENT, # blah`, at :2:3 (Exception)
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in 'raise:NoReturn'
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in 'raise:NoReturn'
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in 'Crystal::Formatter#write_keyword:Crystal::Token'
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in 'Crystal::ASTNode+@Crystal::ASTNode#accept:(Bool | Nil)'
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in 'Crystal::Formatter#accept_assign_value:(Array(Crystal::Formatter::AlignInfo) | Nil)'
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in 'Crystal::ASTNode+@Crystal::ASTNode#accept:(Bool | Nil)'
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in 'Crystal::Command::FormatCommand#format_source:(IO+ | Int32 | Nil)'
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in 'Crystal::Command::FormatCommand#format_many:Nil'
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in 'Crystal::Command#format:NoReturn'
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in 'Crystal::Command#tool:(Bool | Nil)'
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in '__crystal_main'
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in 'main'
couldn't format <snipped-filename>, please report a bug including the contents of it: https://github.com/crystal-lang/crystal/issues

Output from second snippet

> crystal tool format --show-backtrace
Nil assertion failed (NilAssertionError)
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in 'raise:NoReturn'
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in 'Nil#not_nil!:NoReturn'
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in 'Crystal::ASTNode+@Crystal::ASTNode#accept:(Bool | Nil)'
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in 'Crystal::Formatter#format_args_simple:Tuple(Bool, Bool, Int32)'
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in 'Crystal::Formatter#format_args:Tuple(Bool | Nil, Bool, Int32)'
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in 'Crystal::Formatter#visit:Bool'
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in 'Crystal::ASTNode+@Crystal::ASTNode#accept:(Bool | Nil)'
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in 'Crystal::Formatter#accept_assign_value:(Array(Crystal::Formatter::AlignInfo) | Nil)'
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in 'Crystal::ASTNode+@Crystal::ASTNode#accept:(Bool | Nil)'
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in 'Crystal::Command::FormatCommand#format_source:(IO+ | Int32 | Nil)'
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in 'Crystal::Command::FormatCommand#format_many:Nil'
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in 'Crystal::Command#format:NoReturn'
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in 'Crystal::Command#tool:(Bool | Nil)'
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in '__crystal_main'
  from /opt/homebrew/Cellar/crystal/1.4.1/libexec/crystal in 'main'
couldn't format <snipped-filename> please report a bug including the contents of it: https://github.com/crystal-lang/crystal/issues

I added the \ to try to suppress the formatter's default behavior of moving the comment up onto line 1, leaving line 2 blank:

bug = # blah

  puts(["hi"])

Compiler version:

> crystal --version
Crystal 1.4.1 (2022-04-22)

LLVM: 13.0.1
Default target: aarch64-apple-darwin21.5.0

---

Quick tangentially related question: Is automatic splitting of long lines on the roadmap? It would make the formatter much more useful to me.

Thanks :)