Crash "Bad state: No element" in AlertBlockSyntax.parseChildLines

[jonasfj]

I ran test/crash_test.dart and found 9 markdown files where package:markdown crashes:

Bad state: No element
#0      List.last (dart:core-patch/growable_array.dart:348:5)
dart-lang/markdown#1      AlertBlockSyntax.parseChildLines (package:markdown/src/block_syntaxes/alert_block_syntax.dart:54:35)
dart-lang/markdown#2      AlertBlockSyntax.parse (package:markdown/src/block_syntaxes/alert_block_syntax.dart:85:24)
dart-lang/markdown#3      BlockParser.parseLines (package:markdown/src/block_parser.dart:178:32)
dart-lang/markdown#4      Document.parseLineList (package:markdown/src/document.dart:87:44)
dart-lang/markdown#5      Document.parse (package:markdown/src/document.dart:83:36)
dart-lang/markdown#6      markdownToHtml (package:markdown/src/html_renderer.dart:40:26)

Full log in: https://gist.github.com/jonasfj/9d8dfb702f46e64b78a22f5762ac2f95

This ran a scan of all .md files in the latest version of all packages on pub.dev.

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@AlexV525, @devoncarew, could this be related to:

• ✨ Introduce AlertBlockSyntax dart-archive/markdown#570, or
• address a termination issue with GitHub alert syntax parsing dart-archive/markdown#576

[AlexV525]

@jonasfj Thanks for the report. Unfortunately, I'm doing other work which occupied most of my time so I cannot respond to this in recent days. I can look into this when I'm available.