message: fix clippy warning on non-linux systems
diff: @@ -12,7 +12,6 @@ use crate::utils::{copy_dir_all, parse_rustc_version, CargoMetadata};
  use crate::{db::blacklist::is_blacklisted, utils::MetadataPackage};
  use crate::{Config, Context, Index, Metrics, Storage};
  use docsrs_metadata::{Metadata, DEFAULT_TARGETS, HOST_TARGET};
  -use failure::ResultExt;
  use log::{debug, info, warn, LevelFilter};
  use postgres::Client;
  use rustwide::cmd::{Command, CommandError, SandboxBuilder, SandboxImage};
  @@ -271,6 +270,8 @@ impl RustwideBuilder {
  let limits = Limits::for_crate(&mut conn, name)?;
  #[cfg(target_os = "linux")]
  if !self.config.disable_memory_limit {
  + use failure::ResultExt;
  +
  let mem_info = procfs::Meminfo::new().context("failed to read /proc/meminfo")?;
  let available = mem_info
  .mem_available
  