message: Derive Debug on these small structs.
diff: @@ -110,13 +110,13 @@ impl Default for MemoryBoundCheckMode {
  }
  }
  -#[derive(Default)]
  +#[derive(Debug, Default)]
  pub struct Features {
  pub simd: bool,
  }
  /// Configuration data for the compiler
  -#[derive(Default)]
  +#[derive(Debug, Default)]
  pub struct CompilerConfig {
  /// Symbol information generated from emscripten; used for more detailed debug messages
  pub symbol_map: Option<HashMap<u32, String>>,
  