Womtool misses syntax that leads to Cromwell runtime error.

[williamrowell]

Tested/linted on:

• womtool validate v86 and v87
• cromwell run v86 and v87 with default configuration
• miniwdl check/run v1.12.1 with minimal configuration
• wdlTools check v0.17.17

version 1.0

workflow wf {
  input {
    String? name
  }
  output {
    String workflow_name = "hello~{" " + name}"
  }
}

This workflow lints successfully with all tools listed above.

It runs successfully on miniwdl/DNAnexus (after dxCompiler) with or without providing name as an input. On Cromwell, if name is provided, it completes successfully, but without name, it returns the error below.

[2024-11-15 09:46:04,37] [info] WorkflowManagerActor: Workflow b6319060-faec-4206-9fe0-4322f6eb8986 failed (during ExecutingWorkflowState): java.lang.RuntimeException: Failed to evaluate 'wf.workflow_name' (reason 1 of 1): Evaluating "hello~{(" " + name)}" failed: Sorry! Operation + is not supported on empty optional values. You might resolve this using select_first([optional, default]) to guarantee that you have a filled value.

If this syntax is not supported by Cromwell, womtool validate should object.