rustc: Move diagnostic to rustsyntax

Author: brson

src/rustc/driver/diagnostic.rs renamed to src/librustsyntax/diagnostic.rs

@@ -1,6 +1,5 @@
 import std::term;
 import io::writer_util;
-import syntax::codemap;
 import codemap::span;
 
 export emitter, emit;

src/librustsyntax/rustsyntax.rc

@@ -6,6 +6,7 @@
 
 use std;
 
+mod diagnostic;
 mod codemap;
 mod ast;
 mod ast_util;

src/rustc/driver.rs

@@ -0,0 +1,5 @@
+import rustsyntax::diagnostic;
+export diagnostic;
+
+export driver;
+export session;

src/rustc/rustc.rc

@@ -133,7 +133,6 @@ mod metadata {
 mod driver {
     mod driver;
     mod session;
-    mod diagnostic;
 }
 
 mod util {