rust-lang#3390: hide_parse_errors to show_parse_errors

Author: llesha

src/config/mod.rs

@@ -169,7 +169,8 @@ create_config! {
             "Enables unstable features. Only available on nightly channel";
     disable_all_formatting: bool, false, true, "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";
+    show_parse_errors: bool, true, true, "Show errors from the parser";
+    hide_parse_errors: bool, false, false, "(deprecated: use show_parse_errors instead)";
     error_on_line_overflow: bool, false, 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/parse/session.rs

@@ -122,7 +122,7 @@ fn default_handler(
     source_map: Lrc<SourceMap>,
     ignore_path_set: Lrc<IgnorePathSet>,
     can_reset: Lrc<AtomicBool>,
-    hide_parse_errors: bool,
+    show_parse_errors: bool,
     color: Color,
 ) -> Handler {
     let supports_color = term::stderr().map_or(false, |term| term.supports_color());
@@ -132,7 +132,7 @@ fn default_handler(
         ColorConfig::Never
     };
 
-    let emitter = if hide_parse_errors {
+    let emitter = if !show_parse_errors {
         silent_emitter()
     } else {
         let fallback_bundle = rustc_errors::fallback_fluent_bundle(
@@ -159,11 +159,21 @@ impl ParseSess {
         let source_map = Lrc::new(SourceMap::new(FilePathMapping::empty()));
         let can_reset_errors = Lrc::new(AtomicBool::new(false));
 
+        let show_parse_errors = if config.was_set().hide_parse_errors() {
+            eprintln!(
+                "Warning: the `hide_parse_errors` option is deprecated. \
+                Use `show_parse_errors` instead"
+            );
+            config.hide_parse_errors()
+        } else {
+            config.show_parse_errors()
+        };
+
         let handler = default_handler(
             Lrc::clone(&source_map),
             Lrc::clone(&ignore_path_set),
             Lrc::clone(&can_reset_errors),
-            config.hide_parse_errors(),
+            show_parse_errors,
             config.color(),
         );
         let parse_sess = RawParseSess::with_span_handler(handler, source_map);