Reposting from Slack:

Jay Håkansson
When running with NXF_SYNTAX_PARSER=v2 I get error messages about "it" being used in closures:

Error test.nf:-1:-1: The current parameter list already contains a parameter of the name it

but I thought that was the standard variable name for groovy? If I name the variables uniquely for each purpose, this issue disappears.

This causes errors:

Channel.fromPath( "${params.ref_genome}" , type: "file", checkIfExists: true ).multiMap { it -> core: NBPs: it }.set { ref_gen }
Channel.fromPath(params.fastq, type: "dir", checkIfExists: true).multiMap { it -> to_format: to_assembly: to_subsamp: it }.set { fastq_ch }

while if I change just one of them to not use "it" it's fine.

This sounds like a best-practices warning that is incorrectly being raised as an error, I don't think that it should be halting workflow execution.