Cli.env_first: def of cli@0.2.0.0
Import: import cli@0.2.0.0/cli.bend as Cli
Lines 3734-3739 of cli@0.2.0.0/cli.bend: https://jend.leeeet.dev/read.txt?path=cli@0.2.0.0/cli.bend&start_line=3734&end_line=3739

import Base

# found, or else the first of names that is set and not empty in vars.
def env_first(names: List<&2, String>, found: Maybe<&2, EnvValue>,
    +vars: List<&2, Var>) -> Maybe<&2, EnvValue>:
  match names:
    case Nil{}: found
    case name <> tail: env_first(tail, env_next(found, name, vars), vars)

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String
  https://jend.leeeet.dev/definition.txt?path=cli@0.2.0.0/cli.bend&name=EnvValue
  https://jend.leeeet.dev/definition.txt?path=cli@0.2.0.0/cli.bend&name=Var
  https://jend.leeeet.dev/definition.txt?path=cli@0.2.0.0/cli.bend&name=env_next