Level nesting error when formatting many cascading `elsif` clauses.

[davebenvenuti]

I noticed SyntaxTree.format has trouble with many (thousands) of subsequent elsif clauses. Here's an admittedly contrived example:

OS: macOS Sequoia 15.2
Ruby Version: ruby 3.3.4 (2024-07-09 revision be1089c8ec) [arm64-darwin23]
syntax_tree Version: 6.2.0

syntax_tree_nesting_error.rb

#!/usr/bin/env ruby

require "erb"
require "syntax_tree"

SyntaxTree.format(ERB.new(<<~RUBY, trim_mode: "-").result)
  def foo(x)
    if x == 0
      return :"0"
    <%- (1...5000).each do |i| -%>
    elsif x == <%= i %>
      return :"<%= i %>"
    <%- end -%>
    end
  end
RUBY

Output

ruby syntax_tree_nesting_error.rb
/Users/dave/.gem/ruby/3.3.4/gems/syntax_tree-6.2.0/lib/syntax_tree/parser.rb:2864:in `on_parse_error': nesting too deep (SyntaxTree::Parser::ParseError)
        from /Users/dave/.gem/ruby/3.3.4/gems/syntax_tree-6.2.0/lib/syntax_tree.rb:124:in `parse'
        from /Users/dave/.gem/ruby/3.3.4/gems/syntax_tree-6.2.0/lib/syntax_tree.rb:124:in `parse'
        from /Users/dave/.gem/ruby/3.3.4/gems/syntax_tree-6.2.0/lib/syntax_tree.rb:68:in `format'
        from syntax_tree_nesting_error.rb:6:in `<main>'

Interestingly, the same idea except with single-line conditionals works fine:

syntax_tree_single_line_conditionals.rb

#!/usr/bin/env ruby

require "erb"
require "syntax_tree"

SyntaxTree.format(ERB.new(<<~RUBY, trim_mode: "-").result)
  def foo(x)
    return :"0"
    <%- (1...5000).each do |i| -%>
    return :"<%= i %>" if x == <%= i %>
    <%- end -%>
  end
RUBY

This version runs without raising an error.