Up.heads.branch: def of ezx@1.11.0.0
Import: import ezx@1.11.0.0/src/lock/up.bend as Up
Lines 906-911 of ezx@1.11.0.0/src/lock/up.bend: https://jend.leeeet.dev/read.txt?path=ezx@1.11.0.0/src/lock/up.bend&start_line=906&end_line=911

import Base

# a remote whose HEAD names no branch leaves nothing to pin
def heads.branch(+name: String, +url: String) -> Named:
  Bool.pick(Named, String.is_empty(name),
    NamedNo{"ez: " ++ url ++
      " has no semver-ish tag and its HEAD names no branch; name a ref to pin"},
    Named{name})

Uses (5):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.pick
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String.append
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String.is_empty
  https://jend.leeeet.dev/definition.txt?path=ezx@1.11.0.0/src/lock/up.bend&name=Named