Add colors example

examples/colors.rs

+extern crate termion;
+
+use termion::{TermWrite, Color, Style};
+use std::io::{self, Write};
+
+const LINE_NUM_BG: Color = Color::Grayscale(5);
+const LINE_NUM_FG: Color = Color::Grayscale(18);
+const ERROR_FG: Color = Color::Grayscale(17);
+const INFO_LINE: &'static str = "│  ";
+
+fn main() {
+    let stdout = io::stdout();
+    let mut stdout = stdout.lock();
+
+    stdout.color(Color::LightGreen).unwrap();
+    stdout.write("—— src/test/ui/borrow-errors.rs at 82:18 ——\n".as_bytes()).unwrap();
+    stdout.reset().unwrap();
+
+    stdout.color(Color::Red).unwrap();
+    stdout.style(Style::Bold).unwrap();
+    stdout.write(b"error: ").unwrap();
+    stdout.reset().unwrap();
+
+    stdout.style(Style::Bold).unwrap();
+    stdout.write(b"two closures require unique access to `vec` at the same time").unwrap();
+    stdout.reset().unwrap();
+
+    stdout.style(Style::Bold).unwrap();
+    stdout.color(Color::Magenta).unwrap();
+    stdout.write(b" [E0524]\n").unwrap();
+    stdout.reset().unwrap();
+
+    stdout.color(LINE_NUM_FG).unwrap();
+    stdout.bg_color(LINE_NUM_BG).unwrap();
+    stdout.write(b"79 ").unwrap();
+    stdout.reset().unwrap();
+
+    stdout.write(b"     let append = |e| {\n").unwrap();
+
+    stdout.color(LINE_NUM_FG).unwrap();
+    stdout.bg_color(LINE_NUM_BG).unwrap();
+    stdout.write(INFO_LINE.as_bytes()).unwrap();
+    stdout.reset().unwrap();
+    stdout.color(Color::Red).unwrap();
+    stdout.write("                  ━━━ ".as_bytes()).unwrap();
+    stdout.reset().unwrap();
+
+    stdout.color(ERROR_FG).unwrap();
+    stdout.write(b"first closure is constructed here\n").unwrap();
+    stdout.reset().unwrap();
+
+    stdout.color(LINE_NUM_FG).unwrap();
+    stdout.bg_color(LINE_NUM_BG).unwrap();
+    stdout.write(b"80 ").unwrap();
+    stdout.reset().unwrap();
+
+    stdout.write(b"         vec.push(e)\n").unwrap();
+
+    stdout.color(LINE_NUM_FG).unwrap();
+    stdout.bg_color(LINE_NUM_BG).unwrap();
+    stdout.write(INFO_LINE.as_bytes()).unwrap();
+    stdout.reset().unwrap();
+    stdout.color(Color::Red).unwrap();
+    stdout.write("         ━━━ ".as_bytes()).unwrap();
+    stdout.reset().unwrap();
+
+    stdout.color(ERROR_FG).unwrap();
+    stdout.write(b"previous borrow occurs due to use of `vec` in closure\n").unwrap();
+    stdout.reset().unwrap();
+
+    stdout.color(LINE_NUM_FG).unwrap();
+    stdout.bg_color(LINE_NUM_BG).unwrap();
+    stdout.write(b"81 ").unwrap();
+    stdout.reset().unwrap();
+    stdout.write(b"     };\n").unwrap();
+
+    stdout.color(LINE_NUM_FG).unwrap();
+    stdout.bg_color(LINE_NUM_BG).unwrap();
+    stdout.write(b"82 ").unwrap();
+    stdout.reset().unwrap();
+    stdout.write(b"     let append = |e| {\n").unwrap();
+
+    stdout.color(LINE_NUM_FG).unwrap();
+    stdout.bg_color(LINE_NUM_BG).unwrap();
+    stdout.write(INFO_LINE.as_bytes()).unwrap();
+    stdout.reset().unwrap();
+    stdout.color(Color::Red).unwrap();
+    stdout.write("                  ━━━ ".as_bytes()).unwrap();
+    stdout.reset().unwrap();
+
+    stdout.color(ERROR_FG).unwrap();
+    stdout.write(b"second closure is constructed here\n").unwrap();
+    stdout.reset().unwrap();
+
+    stdout.color(LINE_NUM_FG).unwrap();
+    stdout.bg_color(LINE_NUM_BG).unwrap();
+    stdout.write(b"83 ").unwrap();
+    stdout.reset().unwrap();
+
+    stdout.write(b"         vec.push(e)\n").unwrap();
+
+    stdout.color(LINE_NUM_FG).unwrap();
+    stdout.bg_color(LINE_NUM_BG).unwrap();
+    stdout.write(INFO_LINE.as_bytes()).unwrap();
+    stdout.reset().unwrap();
+    stdout.color(Color::Red).unwrap();
+    stdout.write("         ━━━ ".as_bytes()).unwrap();
+    stdout.reset().unwrap();
+
+    stdout.color(ERROR_FG).unwrap();
+    stdout.write(b"borrow occurs due to use of `vec` in closure\n").unwrap();
+    stdout.reset().unwrap();
+
+    stdout.color(LINE_NUM_FG).unwrap();
+    stdout.bg_color(LINE_NUM_BG).unwrap();
+    stdout.write(b"84 ").unwrap();
+    stdout.reset().unwrap();
+    stdout.write(b"     };\n").unwrap();
+
+    stdout.color(LINE_NUM_FG).unwrap();
+    stdout.bg_color(LINE_NUM_BG).unwrap();
+    stdout.write(b"85 ").unwrap();
+    stdout.reset().unwrap();
+    stdout.write(b" }\n").unwrap();
+
+    stdout.color(LINE_NUM_FG).unwrap();
+    stdout.bg_color(LINE_NUM_BG).unwrap();
+    stdout.write(INFO_LINE.as_bytes()).unwrap();
+    stdout.reset().unwrap();
+    stdout.color(Color::Red).unwrap();
+    stdout.write(" ━ ".as_bytes()).unwrap();
+    stdout.reset().unwrap();
+
+    stdout.color(ERROR_FG).unwrap();
+    stdout.write(b"borrow from first closure ends here\n").unwrap();
+    stdout.reset().unwrap();
+}