Downgrade term crate back down to 0.2 (from 0.4).

This is undoing part of commit dd34296

Fix #2338

(Unfortunately I do not have a suggestion for how to make a unit test
for this problem; doing so would require putting in a bit more effort
than I have time for at the moment.)

Author: pnkfelix

Cargo.lock

@@ -37,7 +37,7 @@ regex = "0.1"
 rustc-serialize = "0.3"
 semver = "0.2.0"
 tar = "0.4"
-term = "0.4"
+term = "0.2"
 time = "0.1"
 toml = "0.1"
 url = "0.2"

Cargo.toml

@@ -3,7 +3,7 @@ use std::io::prelude::*;
 use std::io;
 
 use term::color::{Color, BLACK, RED, GREEN, YELLOW};
-use term::{self, Terminal, TerminfoTerminal, color, Attr};
+use term::{Terminal, TerminfoTerminal, color, Attr};
 
 use self::AdequateTerminal::{NoColor, Colored};
 use self::Verbosity::{Verbose, Normal, Quiet};
@@ -193,24 +193,22 @@ impl Shell {
         Ok(())
     }
 
-    fn fg(&mut self, color: color::Color) -> CargoResult<bool> {
+    fn fg(&mut self, color: color::Color) -> io::Result<bool> {
         let colored = self.colored();
 
         match self.terminal {
-            Colored(ref mut c) if colored => try!(c.fg(color)),
-            _ => return Ok(false),
+            Colored(ref mut c) if colored => c.fg(color),
+            _ => Ok(false),
         }
-        Ok(true)
     }
 
-    fn attr(&mut self, attr: Attr) -> CargoResult<bool> {
+    fn attr(&mut self, attr: Attr) -> io::Result<bool> {
         let colored = self.colored();
 
         match self.terminal {
-            Colored(ref mut c) if colored => try!(c.attr(attr)),
-            _ => return Ok(false)
+            Colored(ref mut c) if colored => c.attr(attr),
+            _ => Ok(false)
         }
-        Ok(true)
     }
 
     fn supports_attr(&self, attr: Attr) -> bool {
@@ -222,14 +220,13 @@ impl Shell {
         }
     }
 
-    fn reset(&mut self) -> term::Result<()> {
+    fn reset(&mut self) -> io::Result<()> {
         let colored = self.colored();
 
         match self.terminal {
-            Colored(ref mut c) if colored => try!(c.reset()),
-            _ => ()
+            Colored(ref mut c) if colored => c.reset().map(|_| ()),
+            _ => Ok(())
         }
-        Ok(())
     }
 
     fn colored(&self) -> bool {

src/cargo/core/shell.rs

@@ -9,7 +9,6 @@ use curl;
 use git2;
 use rustc_serialize::json;
 use semver;
-use term;
 use toml;
 use url;
 
@@ -307,7 +306,6 @@ from_error! {
     url::ParseError,
     toml::DecodeError,
     ffi::NulError,
-    term::Error,
 }
 
 impl<E: CargoError> From<Human<E>> for Box<CargoError> {
@@ -327,7 +325,6 @@ impl CargoError for toml::Error {}
 impl CargoError for toml::DecodeError {}
 impl CargoError for url::ParseError {}
 impl CargoError for ffi::NulError {}
-impl CargoError for term::Error {}
 
 // =============================================================================
 // Construction helpers