Fix with_emitter callers

Author: estebank

src/librustc_driver/test.rs

@@ -113,7 +113,7 @@ fn test_env_with_pool<F>(
 ) where
     F: FnOnce(Env),
 {
-    let diagnostic_handler = errors::Handler::with_emitter(true, false, emitter);
+    let diagnostic_handler = errors::Handler::with_emitter(true, None, emitter);
     let sess = session::build_session_(
         options,
         None,

src/libsyntax/parse/lexer/mod.rs

@@ -1920,7 +1920,7 @@ mod tests {
                                                           false,
                                                           false);
         ParseSess {
-            span_diagnostic: errors::Handler::with_emitter(true, false, Box::new(emitter)),
+            span_diagnostic: errors::Handler::with_emitter(true, None, Box::new(emitter)),
             unstable_features: UnstableFeatures::from_environment(),
             config: CrateConfig::default(),
             included_mod_stack: Lock::new(Vec::new()),

src/libsyntax/test_snippet.rs

@@ -58,7 +58,7 @@ fn test_harness(file_text: &str, span_labels: Vec<SpanLabel>, expected_output: &
                                         Some(source_map.clone()),
                                         false,
                                         false);
-        let handler = Handler::with_emitter(true, false, Box::new(emitter));
+        let handler = Handler::with_emitter(true, None, Box::new(emitter));
         handler.span_err(msp, "foo");
 
         assert!(expected_output.chars().next() == Some('\n'),