Merge pull request #2327 from nrc/macro-defs

Some macros 2.0 macro defs

Author: nrc

src/config.rs

@@ -684,6 +684,7 @@ create_config! {
             "Enables unstable features. Only available on nightly channel";
     disable_all_formatting: bool, false, false, "Don't reformat anything";
     skip_children: bool, false, false, "Don't reformat out of line modules";
+    hide_parse_errors: bool, false, false, "Hide errors from the parser";
     error_on_line_overflow: bool, true, false, "Error if unable to get all lines within max_width";
     error_on_unformatted: bool, false, false,
         "Error if unable to get comments or string literals within max_width, \

src/lib.rs

@@ -9,6 +9,7 @@
 // except according to those terms.
 
 #![feature(rustc_private)]
+#![feature(type_ascription)]
 
 #[macro_use]
 extern crate derive_new;
@@ -597,8 +598,16 @@ pub fn format_input<T: Write>(
     }
     let codemap = Rc::new(CodeMap::new(FilePathMapping::empty()));
 
-    let tty_handler =
-        Handler::with_tty_emitter(ColorConfig::Auto, true, false, Some(codemap.clone()));
+    let tty_handler = if config.hide_parse_errors() {
+        let silent_emitter = Box::new(EmitterWriter::new(
+            Box::new(Vec::new()),
+            Some(codemap.clone()),
+            false,
+        ));
+        Handler::with_emitter(true, false, silent_emitter)
+    } else {
+        Handler::with_tty_emitter(ColorConfig::Auto, true, false, Some(codemap.clone()))
+    };
     let mut parse_session = ParseSess::with_span_handler(tty_handler, codemap.clone());
 
     let main_file = match input {