Prove.head.of: def of ezx@1.11.0.0
Import: import ezx@1.11.0.0/src/ez/prove.bend as Prove
Lines 56-62 of ezx@1.11.0.0/src/ez/prove.bend: https://jend.leeeet.dev/read.txt?path=ezx@1.11.0.0/src/ez/prove.bend&start_line=56&end_line=62

import Base

# the first line of a run's output
def head.of(ls: List<&2, String>) -> String:
  match ls:
    case []:
      ""
    case h <> _t:
      h

Uses (2):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String