Checked std.format Error: "Attempted to access an uninitialized payload."

[dlangBugzillaToGithub]

acehreli (@acehreli) reported this on 2019-10-24T17:35:20Z

Transfered from https://issues.dlang.org/show_bug.cgi?id=20317

Description

import std.stdio;
import std.string;

void main() {
  auto lines = File("foo").byLine;
  auto result = format!"%s"(lines);
}

The compilation fails with

/usr/include/dmd/phobos/std/typecons.d(6455): Error: `"Attempted to access an uninitialized payload."`
[...]