De-emph minimized spans, add better debugging output

src/libsyntax/errors/emitter.rs

@@ -526,6 +526,10 @@ impl Destination {
             }
             Style::OldSkoolNote => {
                 self.start_attr(term::Attr::Bold)?;
+                self.start_attr(term::Attr::ForegroundColor(term::color::BRIGHT_GREEN))?;
+            }
+            Style::OldSkoolNoteText => {
+                self.start_attr(term::Attr::Bold)?;
             }
             Style::UnderlinePrimary | Style::LabelPrimary => {
                 self.start_attr(term::Attr::Bold)?;

src/libsyntax/errors/snippet/mod.rs

@@ -58,6 +58,9 @@ struct Annotation {
     /// Is this annotation derived from primary span
     is_primary: bool,
 
+    /// Is this a large span minimized down to a smaller span
+    is_minimized: bool,
+
     /// Optional label to display adjacent to the annotation.
     label: Option<String>,
 }
@@ -90,6 +93,7 @@ pub enum Style {
     UnderlineSecondary,
     LabelPrimary,
     LabelSecondary,
+    OldSkoolNoteText,
     OldSkoolNote,
     NoStyle,
 }
@@ -383,10 +387,10 @@ impl FileInfo {
         // Basically, although this loses information, multi-line spans just
         // never look good.
 
-        let (line, start_col, mut end_col) = if lines.len() == 1 {
+        let (line, start_col, mut end_col, is_minimized) = if lines.len() == 1 {
-            (lines[0].line_index, lines[0].start_col, lines[0].end_col)
+            (lines[0].line_index, lines[0].start_col, lines[0].end_col, false)
         } else {
-            (lines[0].line_index, lines[0].start_col, CharPos(lines[0].start_col.0 + 1))
+            (lines[0].line_index, lines[0].start_col, CharPos(lines[0].start_col.0 + 1), true)
         };
 
         // Watch out for "empty spans". If we get a span like 6..6, we
@@ -402,6 +406,7 @@ impl FileInfo {
         self.lines[index].push_annotation(start_col,
                                           end_col,
                                           is_primary,
+                                          is_minimized,
                                           label);
     }
 
@@ -498,6 +503,7 @@ impl FileInfo {
                     match self.primary_span {
                         Some(span) => {
                             let lo = codemap.lookup_char_pos(span.lo);
+                            let hi = codemap.lookup_char_pos(span.hi);
                             //Before each secondary line in old skool-mode, print the label
                             //as an old-style note
                             if !line.annotations[0].is_primary {
@@ -507,14 +513,15 @@ impl FileInfo {
                                             text: lo.file.name.clone(),
                                             style: Style::FileNameStyle,
                                         }, StyledString {
-                                            text: format!(":{}:{}: ", lo.line, lo.col.0 + 1),
+                                            text: format!(":{}:{}: {}:{} ", lo.line, lo.col.0 + 1,
+                                                hi.line, hi.col.0+1),
                                             style: Style::LineAndColumn,
                                         }, StyledString {
                                             text: format!("note: "),
-                                            style: Style::LabelSecondary,
+                                            style: Style::OldSkoolNote,
                                         }, StyledString {
                                             text: format!("{}", ann),
-                                            style: Style::OldSkoolNote,
+                                            style: Style::OldSkoolNoteText,
                                         }],
                                         kind: RenderedLineKind::Annotations,
                                     });
@@ -621,7 +628,7 @@ impl FileInfo {
                             if annotation.is_primary {
                                 Style::UnderlinePrimary
                             } else {
-                                Style::UnderlineSecondary
+                                Style::OldSkoolNote
                             });
                     }
                     else {
@@ -629,7 +636,7 @@ impl FileInfo {
                             if annotation.is_primary {
                                 Style::UnderlinePrimary
                             } else {
-                                Style::UnderlineSecondary
+                                Style::OldSkoolNote
                             });
                     }
                 }
@@ -638,10 +645,14 @@ impl FileInfo {
                 for p in annotation.start_col .. annotation.end_col {
                     if annotation.is_primary {
                         styled_buffer.putc(1, p, '^', Style::UnderlinePrimary);
-                        styled_buffer.set_style(0, p, Style::UnderlinePrimary);
+                        if !annotation.is_minimized {
+                            styled_buffer.set_style(0, p, Style::UnderlinePrimary);
+                        }
                     } else {
                         styled_buffer.putc(1, p, '-', Style::UnderlineSecondary);
-                        styled_buffer.set_style(0, p, Style::UnderlineSecondary);
+                        if !annotation.is_minimized {
+                            styled_buffer.set_style(0, p, Style::UnderlineSecondary);
+                        }
                     }
                 }
             }
@@ -842,11 +853,13 @@ impl Line {
                        start: CharPos,
                        end: CharPos,
                        is_primary: bool,
+                       is_minimized: bool,
                        label: Option<String>) {
         self.annotations.push(Annotation {
             start_col: start.0,
             end_col: end.0,
             is_primary: is_primary,
+            is_minimized: is_minimized,
             label: label,
         });
     }

src/tools/compiletest/src/json.rs

@@ -12,6 +12,7 @@ use errors::{Error, ErrorKind};
 use rustc_serialize::json;
 use std::str::FromStr;
 use std::path::Path;
+use runtest::{fatal_proc_rec, ProcRes};
 
 // These structs are a subset of the ones found in
 // `syntax::errors::json`.
@@ -55,13 +56,13 @@ struct DiagnosticCode {
     explanation: Option<String>,
 }
 
-pub fn parse_output(file_name: &str, output: &str) -> Vec<Error> {
+pub fn parse_output(file_name: &str, output: &str, proc_res: &ProcRes) -> Vec<Error> {
     output.lines()
-          .flat_map(|line| parse_line(file_name, line))
+          .flat_map(|line| parse_line(file_name, line, output, proc_res))
           .collect()
 }
 
-fn parse_line(file_name: &str, line: &str) -> Vec<Error> {
+fn parse_line(file_name: &str, line: &str, output: &str, proc_res: &ProcRes) -> Vec<Error> {
     // The compiler sometimes intermingles non-JSON stuff into the
     // output.  This hack just skips over such lines. Yuck.
     if line.chars().next() == Some('{') {
@@ -72,7 +73,9 @@ fn parse_line(file_name: &str, line: &str) -> Vec<Error> {
                 expected_errors
             }
             Err(error) => {
-                panic!("failed to decode compiler output as json: `{}`", error);
+                fatal_proc_rec(None, &format!(
+                    "failed to decode compiler output as json: `{}`\noutput: {}\nline: {}",
+                    error, line, output), proc_res);
             }
         }
     } else {

src/tools/compiletest/src/runtest.rs

@@ -1001,7 +1001,7 @@ actual:\n\
         let expect_note = expected_errors.iter().any(|ee| ee.kind == Some(ErrorKind::Note));
 
         // Parse the JSON output from the compiler and extract out the messages.
-        let actual_errors = json::parse_output(&file_name, &proc_res.stderr);
+        let actual_errors = json::parse_output(&file_name, &proc_res.stderr, &proc_res);
         let mut unexpected = 0;
         let mut not_found = 0;
         let mut found = vec![false; expected_errors.len()];
@@ -1528,7 +1528,7 @@ actual:\n\
         self.error(err); panic!();
     }
 
-    fn fatal_proc_rec(&self, err: &str, proc_res: &ProcRes) -> ! {
+    pub fn fatal_proc_rec(&self, err: &str, proc_res: &ProcRes) -> ! {
         self.error(err);
         print!("\
             status: {}\n\
@@ -2197,7 +2197,7 @@ struct ProcArgs {
     args: Vec<String>,
 }
 
-struct ProcRes {
+pub struct ProcRes {
     status: Status,
     stdout: String,
     stderr: String,