https://git.ruby-lang.org/ruby.git/commit/?id=d9f1b8baa3

From d9f1b8baa3a21b2a65af7fcab6a45c30b3f9efee Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Fri, 12 Aug 2022 14:04:04 +0900
Subject: [ruby/error_highlight] Add a note about the current limitation of
 ErrorHighlight.spot

https://github.com/ruby/error_highlight/commit/489ce80a62
---
 lib/error_highlight/base.rb | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/error_highlight/base.rb b/lib/error_highlight/base.rb
index dbd173a5cd..4c115cc828 100644
--- a/lib/error_highlight/base.rb
+++ b/lib/error_highlight/base.rb
@@ -22,6 +22,14 @@ module ErrorHighlight https://github.com/ruby/ruby/blob/trunk/lib/error_highlight/base.rb#L22
   #    snippet: String,
   #    script_lines: [String],
   #  } | nil
+  #
+  # Limitations:
+  #
+  # Currently, ErrorHighlight.spot only supports a single-line code fragment.
+  # Therefore, if the return value is not nil, first_lineno and last_lineno will have
+  # the same value. If the relevant code fragment spans multiple lines
+  # (e.g., Array#[] of +ary[(newline)expr(newline)]+), the method will return nil.
+  # This restriction may be removed in the future.
   def self.spot(obj, **opts)
     case obj
     when Exception
-- 
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