message: Switch to case-sensitive environment variable.
diff: @@ -889,7 +889,7 @@ fn build_base_args<'a, 'cfg>(
  let exe_path = cx
  .files()
  .bin_link_for_target(bin_target, unit.kind, cx.bcx)?;
  - let key = format!("CARGO_BIN_EXE_{}", bin_target.crate_name().to_uppercase());
  + let key = format!("CARGO_BIN_EXE_{}", bin_target.name());
  cmd.env(&key, exe_path);
  }
  }
  