derive debug for Mir and cache

Author: scottcarr

src/librustc/mir/cache.rs

@@ -15,7 +15,7 @@ use mir::repr::{Mir, BasicBlock};
 
 use rustc_serialize as serialize;
 
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub struct Cache {
     predecessors: RefCell<Option<IndexVec<BasicBlock, Vec<BasicBlock>>>>,
 }

src/librustc/mir/repr.rs

@@ -57,7 +57,7 @@ macro_rules! newtype_index {
 }
 
 /// Lowered representation of a single function.
-#[derive(Clone, RustcEncodable, RustcDecodable)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub struct Mir<'tcx> {
     /// List of basic blocks. References to basic block use a newtyped index type `BasicBlock`
     /// that indexes into this vector.