Pkg.trim.back.at: def of ezx@1.11.0.0
Import: import ezx@1.11.0.0/src/pkg/pkg.bend as Pkg
Lines 91-98 of ezx@1.11.0.0/src/pkg/pkg.bend: https://jend.leeeet.dev/read.txt?path=ezx@1.11.0.0/src/pkg/pkg.bend&start_line=91&end_line=98

import Base

# a character kept before the rest of a line with its trailing blanks
# dropped. The character goes too when it is blank and nothing follows it.
def trim.back.at(gone: Bool, head: Char, rest: String) -> String:
  match gone:
    case True{}:
      SNil{}
    case False{}:
      SCon{head, rest}

Uses (3):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Char
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String