LexerNoViableAltException but script still runs

[awgymer]

Bug report

I am playing around with the syntax trying to understand the language server better and I managed to generate a possible lexical error in nextflow which shows an error but still runs as the user might expect. Unclear whether this is actually a bug, edge-case, or something else

Expected behavior and actual behavior

Either the script doesn't compile, or the error is not raised.

Steps to reproduce the problem

x = [z: 4]

println "$x\ some more"

Note the space after the \.

Using a \ produces a script compilation error with cause: Unexpected character: '"' in the following other cases:

"a\ b"
"\ a"
"a \ "
" \ a"

Program output

N E X T F L O W   ~  version 24.10.3

Launching `./test.nf` [backstabbing_maxwell] DSL2 - revision: 008f33b6cc

unknown recognition error type: groovyjarjarantlr4.v4.runtime.LexerNoViableAltException
[z:4] some more

Environment

• Nextflow version: 24.10.3
• Java version: openjdk version "17.0.10" 2024-01-16
• Operating system: macOS
• Bash version: GNU bash, version 3.2.57