message: Rename show_warnings.
diff: @@ -1172,10 +1172,14 @@ struct OutputOptions {
  /// of empty files are not created. If this is None, the output will not
  /// be cached (such as when replaying cached messages).
  cache_cell: Option<(PathBuf, LazyCell<File>)>,
  - /// If `true`, display any recorded warning messages.
  - /// Other types of messages are processed regardless
  - /// of the value of this flag
  - show_warnings: bool,
  + /// If `true`, display any diagnostics.
  + /// Other types of JSON messages are processed regardless
  + /// of the value of this flag.
  + ///
  + /// This is used primarily for cache replay. If you build with `-vv`, the
  + /// cache will be filled with diagnostics from dependencies. When the
  + /// cache is replayed without `-vv`, we don't want to show them.
  + show_diagnostics: bool,
  warnings_seen: usize,
  errors_seen: usize,
  }
  @@ -1193,7 +1197,7 @@ impl OutputOptions {
  look_for_metadata_directive,
  color,
  cache_cell,
  - show_warnings: true,
  + show_diagnostics: true,
  warnings_seen: 0,
  errors_seen: 0,
  }
  @@ -1319,7 +1323,7 @@ fn on_stderr_line_inner(
  .map(|v| String::from_utf8(v).expect("utf8"))
  .expect("strip should never fail")
  };
  - if options.show_warnings {
  + if options.show_diagnostics {
  count_diagnostic(&msg.level, options);
  state.emit_diag(msg.level, rendered)?;
  }
  @@ -1404,7 +1408,7 @@ fn on_stderr_line_inner(
  // from the compiler, so wrap it in an external Cargo JSON message
  // indicating which package it came from and then emit it.
  - if !options.show_warnings {
  + if !options.show_diagnostics {
  return Ok(true);
  }
  @@ -1438,7 +1442,7 @@ fn replay_output_cache(
  path: PathBuf,
  format: MessageFormat,
  color: bool,
  - show_warnings: bool,
  + show_diagnostics: bool,
  ) -> Work {
  let target = target.clone();
  let mut options = OutputOptions {
  @@ -1446,7 +1450,7 @@ fn replay_output_cache(
  look_for_metadata_directive: true,
  color,
  cache_cell: None,
  - show_warnings,
  + show_diagnostics,
  warnings_seen: 0,
  errors_seen: 0,
  };
  