Fixed error starting with uppercase

Error messages cleaned in librustc/middle

Error messages cleaned in libsyntax

Error messages cleaned in libsyntax more agressively

Error messages cleaned in librustc more aggressively

Fixed affected tests

Fixed other failing tests

Last failing tests fixed

40 files changed, 110 insertions, 110 deletions

diff --git a/src/librustc/back/link.rs b/src/librustc/back/link.rs
index 62fdff49168..531b8bf9034 100644
--- a/src/librustc/back/link.rs
+++ b/src/librustc/back/link.rs
@@ -76,7 +76,7 @@ pub fn WriteOutputFile(
             let result = llvm::LLVMRustWriteOutputFile(
                     Target, PM, M, Output, FileType);
             if !result {
-                llvm_err(sess, ~"Could not write output");
+                llvm_err(sess, ~"could not write output");
             }
         })
     }
@@ -189,7 +189,7 @@ pub mod write {
             for pass in sess.opts.custom_passes.iter() {
                 pass.with_c_str(|s| {
                     if !llvm::LLVMRustAddPass(mpm, s) {
-                        sess.warn(format!("Unknown pass {}, ignoring", *pass));
+                        sess.warn(format!("unknown pass {}, ignoring", *pass));
                     }
                 })
             }
@@ -876,11 +876,11 @@ fn link_binary_output(sess: Session,
     let obj_is_writeable = is_writeable(&obj_filename);
     let out_is_writeable = is_writeable(&out_filename);
     if !out_is_writeable {
-        sess.fatal(format!("Output file {} is not writeable -- check its permissions.",
+        sess.fatal(format!("output file {} is not writeable -- check its permissions.",
                            out_filename.display()));
     }
     else if !obj_is_writeable {
-        sess.fatal(format!("Object file {} is not writeable -- check its permissions.",
+        sess.fatal(format!("object file {} is not writeable -- check its permissions.",
                            obj_filename.display()));
     }
 
diff --git a/src/librustc/driver/session.rs b/src/librustc/driver/session.rs
index 6fb7e749475..dc8598c10d0 100644
--- a/src/librustc/driver/session.rs
+++ b/src/librustc/driver/session.rs
@@ -308,7 +308,7 @@ impl Session_ {
     // This exists to help with refactoring to eliminate impossible
     // cases later on
     pub fn impossible_case(&self, sp: Span, msg: &str) -> ! {
-        self.span_bug(sp, format!("Impossible case reached: {}", msg));
+        self.span_bug(sp, format!("impossible case reached: {}", msg));
     }
     pub fn verbose(&self) -> bool { self.debugging_opt(VERBOSE) }
     pub fn time_passes(&self) -> bool { self.debugging_opt(TIME_PASSES) }
diff --git a/src/librustc/metadata/tydecode.rs b/src/librustc/metadata/tydecode.rs
index 8da097a1b6a..42e4d986837 100644
--- a/src/librustc/metadata/tydecode.rs
+++ b/src/librustc/metadata/tydecode.rs
@@ -527,7 +527,7 @@ fn parse_sig(st: &mut PState, conv: conv_did) -> ty::FnSig {
     let variadic = match next(st) {
         'V' => true,
         'N' => false,
-        r => fail!(format!("Bad variadic: {}", r)),
+        r => fail!(format!("bad variadic: {}", r)),
     };
     let ret_ty = parse_ty(st, |x,y| conv(x,y));
     ty::FnSig {binder_id: id,
diff --git a/src/librustc/metadata/tyencode.rs b/src/librustc/metadata/tyencode.rs
index 4f6ac8607ee..08632b5c9a6 100644
--- a/src/librustc/metadata/tyencode.rs
+++ b/src/librustc/metadata/tyencode.rs
@@ -195,7 +195,7 @@ fn enc_region(w: &mut MemWriter, cx: @ctxt, r: ty::Region) {
         }
         ty::ReInfer(_) => {
             // these should not crop up after typeck
-            cx.diag.handler().bug("Cannot encode region variables");
+            cx.diag.handler().bug("cannot encode region variables");
         }
     }
 }
@@ -320,7 +320,7 @@ fn enc_sty(w: &mut MemWriter, cx: @ctxt, st: &ty::sty) {
             enc_bare_fn_ty(w, cx, f);
         }
         ty::ty_infer(_) => {
-            cx.diag.handler().bug("Cannot encode inference variable types");
+            cx.diag.handler().bug("cannot encode inference variable types");
         }
         ty::ty_param(param_ty {idx: id, def_id: did}) => {
             mywrite!(w, "p{}|{}", (cx.ds)(did), id);
@@ -334,7 +334,7 @@ fn enc_sty(w: &mut MemWriter, cx: @ctxt, st: &ty::sty) {
             enc_substs(w, cx, substs);
             mywrite!(w, "]");
         }
-        ty::ty_err => fail!("Shouldn't encode error type")
+        ty::ty_err => fail!("shouldn't encode error type")
     }
 }
 
diff --git a/src/librustc/middle/borrowck/gather_loans/lifetime.rs b/src/librustc/middle/borrowck/gather_loans/lifetime.rs
index 4c2f0986d9c..e151f398458 100644
--- a/src/librustc/middle/borrowck/gather_loans/lifetime.rs
+++ b/src/librustc/middle/borrowck/gather_loans/lifetime.rs
@@ -215,7 +215,7 @@ impl<'a> GuaranteeLifetimeContext<'a> {
                 // the check above should fail for anything is not ReScope
                 self.bccx.tcx.sess.span_bug(
                     cmt_base.span,
-                    format!("Cannot issue root for scope region: {:?}",
+                    format!("cannot issue root for scope region: {:?}",
                          self.loan_region));
             }
         };
diff --git a/src/librustc/middle/borrowck/gather_loans/mod.rs b/src/librustc/middle/borrowck/gather_loans/mod.rs
index 38d54ddfb42..173120e32f5 100644
--- a/src/librustc/middle/borrowck/gather_loans/mod.rs
+++ b/src/librustc/middle/borrowck/gather_loans/mod.rs
@@ -496,7 +496,7 @@ impl<'a> GatherLoanCtxt<'a> {
                     ty::ReInfer(..) => {
                         self.tcx().sess.span_bug(
                             cmt.span,
-                            format!("Invalid borrow lifetime: {:?}", loan_region));
+                            format!("invalid borrow lifetime: {:?}", loan_region));
                     }
                 };
                 debug!("loan_scope = {:?}", loan_scope);
@@ -820,7 +820,7 @@ impl<'a> GatherLoanCtxt<'a> {
             _ => {
                 self.tcx().sess.span_bug(
                     pat.span,
-                    format!("Type of slice pattern is not a slice"));
+                    format!("type of slice pattern is not a slice"));
             }
         }
     }
diff --git a/src/librustc/middle/borrowck/mod.rs b/src/librustc/middle/borrowck/mod.rs
index 8f6d4de476b..6f3578f667d 100644
--- a/src/librustc/middle/borrowck/mod.rs
+++ b/src/librustc/middle/borrowck/mod.rs
@@ -769,14 +769,14 @@ impl BorrowckCtxt {
                             }
                             _ => {
                                 self.tcx.sess.bug(
-                                    format!("Loan path LpVar({:?}) maps to {:?}, not local",
+                                    format!("loan path LpVar({:?}) maps to {:?}, not local",
                                         id, pat));
                             }
                         }
                     }
                     r => {
                         self.tcx.sess.bug(
-                            format!("Loan path LpVar({:?}) maps to {:?}, not local",
+                            format!("loan path LpVar({:?}) maps to {:?}, not local",
                                  id, r));
                     }
                 }
diff --git a/src/librustc/middle/borrowck/move_data.rs b/src/librustc/middle/borrowck/move_data.rs
index ca9bce19ab8..75549c5944d 100644
--- a/src/librustc/middle/borrowck/move_data.rs
+++ b/src/librustc/middle/borrowck/move_data.rs
@@ -494,7 +494,7 @@ impl MoveData {
                         dfcx_assign.add_kill(kill_id, assignment_index);
                     }
                     LpExtend(..) => {
-                        tcx.sess.bug("Var assignment for non var path");
+                        tcx.sess.bug("var assignment for non var path");
                     }
                 }
             }
diff --git a/src/librustc/middle/cfg/construct.rs b/src/librustc/middle/cfg/construct.rs
index eb9c434ca28..9c213558d9c 100644
--- a/src/librustc/middle/cfg/construct.rs
+++ b/src/librustc/middle/cfg/construct.rs
@@ -507,13 +507,13 @@ impl CFGBuilder {
                         }
                         self.tcx.sess.span_bug(
                             expr.span,
-                            format!("No loop scope for id {:?}", loop_id));
+                            format!("no loop scope for id {:?}", loop_id));
                     }
 
                     r => {
                         self.tcx.sess.span_bug(
                             expr.span,
-                            format!("Bad entry `{:?}` in def_map for label", r));
+                            format!("bad entry `{:?}` in def_map for label", r));
                     }
                 }
             }
diff --git a/src/librustc/middle/check_match.rs b/src/librustc/middle/check_match.rs
index d402305401e..ab9eff3a372 100644
--- a/src/librustc/middle/check_match.rs
+++ b/src/librustc/middle/check_match.rs
@@ -971,7 +971,7 @@ fn check_legality_of_move_bindings(cx: &MatchCheckCtxt,
                     _ => {
                         cx.tcx.sess.span_bug(
                             p.span,
-                            format!("Binding pattern {} is \
+                            format!("binding pattern {} is \
                                   not an identifier: {:?}",
                                  p.id, p.node));
                     }
diff --git a/src/librustc/middle/const_eval.rs b/src/librustc/middle/const_eval.rs
index cbe1e8f72d9..75874339f3a 100644
--- a/src/librustc/middle/const_eval.rs
+++ b/src/librustc/middle/const_eval.rs
@@ -342,8 +342,8 @@ pub fn eval_const_expr_partial<T: ty::ExprTyProvider>(tcx: &T, e: &Expr)
           Ok(const_float(f)) => Ok(const_float(-f)),
           Ok(const_int(i)) => Ok(const_int(-i)),
           Ok(const_uint(i)) => Ok(const_uint(-i)),
-          Ok(const_str(_)) => Err(~"Negate on string"),
-          Ok(const_bool(_)) => Err(~"Negate on boolean"),
+          Ok(const_str(_)) => Err(~"negate on string"),
+          Ok(const_bool(_)) => Err(~"negate on boolean"),
           ref err => ((*err).clone())
         }
       }
@@ -352,7 +352,7 @@ pub fn eval_const_expr_partial<T: ty::ExprTyProvider>(tcx: &T, e: &Expr)
           Ok(const_int(i)) => Ok(const_int(!i)),
           Ok(const_uint(i)) => Ok(const_uint(!i)),
           Ok(const_bool(b)) => Ok(const_bool(!b)),
-          _ => Err(~"Not on float or string")
+          _ => Err(~"not on float or string")
         }
       }
       ExprBinary(_, op, a, b) => {
@@ -371,7 +371,7 @@ pub fn eval_const_expr_partial<T: ty::ExprTyProvider>(tcx: &T, e: &Expr)
               BiNe => fromb(a != b),
               BiGe => fromb(a >= b),
               BiGt => fromb(a > b),
-              _ => Err(~"Can't do this op on floats")
+              _ => Err(~"can't do this op on floats")
             }
           }
           (Ok(const_int(a)), Ok(const_int(b))) => {
@@ -423,14 +423,14 @@ pub fn eval_const_expr_partial<T: ty::ExprTyProvider>(tcx: &T, e: &Expr)
             match op {
               BiShl => Ok(const_int(a << b)),
               BiShr => Ok(const_int(a >> b)),
-              _ => Err(~"Can't do this op on an int and uint")
+              _ => Err(~"can't do this op on an int and uint")
             }
           }
           (Ok(const_uint(a)), Ok(const_int(b))) => {
             match op {
               BiShl => Ok(const_uint(a << b)),
               BiShr => Ok(const_uint(a >> b)),
-              _ => Err(~"Can't do this op on a uint and int")
+              _ => Err(~"can't do this op on a uint and int")
             }
           }
           (Ok(const_bool(a)), Ok(const_bool(b))) => {
@@ -442,10 +442,10 @@ pub fn eval_const_expr_partial<T: ty::ExprTyProvider>(tcx: &T, e: &Expr)
               BiBitOr => a | b,
               BiEq => a == b,
               BiNe => a != b,
-              _ => return Err(~"Can't do this op on bools")
+              _ => return Err(~"can't do this op on bools")
              }))
           }
-          _ => Err(~"Bad operands for binary")
+          _ => Err(~"bad operands for binary")
         }
       }
       ExprCast(base, target_ty) => {
@@ -456,7 +456,7 @@ pub fn eval_const_expr_partial<T: ty::ExprTyProvider>(tcx: &T, e: &Expr)
                 .or_else(|| astconv::ast_ty_to_prim_ty(tcx.ty_ctxt(), target_ty))
                 .unwrap_or_else(|| tcx.ty_ctxt().sess.span_fatal(
                     target_ty.span,
-                    format!("Target type not found for const cast")
+                    format!("target type not found for const cast")
                 ));
 
         let base = eval_const_expr_partial(tcx, base);
@@ -469,7 +469,7 @@ pub fn eval_const_expr_partial<T: ty::ExprTyProvider>(tcx: &T, e: &Expr)
                             const_uint(u) => Ok(const_float(u as f64)),
                             const_int(i) => Ok(const_float(i as f64)),
                             const_float(f) => Ok(const_float(f)),
-                            _ => Err(~"Can't cast float to str"),
+                            _ => Err(~"can't cast float to str"),
                         }
                     }
                     ty::ty_uint(_) => {
@@ -477,7 +477,7 @@ pub fn eval_const_expr_partial<T: ty::ExprTyProvider>(tcx: &T, e: &Expr)
                             const_uint(u) => Ok(const_uint(u)),
                             const_int(i) => Ok(const_uint(i as u64)),
                             const_float(f) => Ok(const_uint(f as u64)),
-                            _ => Err(~"Can't cast str to uint"),
+                            _ => Err(~"can't cast str to uint"),
                         }
                     }
                     ty::ty_int(_) | ty::ty_bool => {
@@ -485,10 +485,10 @@ pub fn eval_const_expr_partial<T: ty::ExprTyProvider>(tcx: &T, e: &Expr)
                             const_uint(u) => Ok(const_int(u as i64)),
                             const_int(i) => Ok(const_int(i)),
                             const_float(f) => Ok(const_int(f as i64)),
-                            _ => Err(~"Can't cast str to int"),
+                            _ => Err(~"can't cast str to int"),
                         }
                     }
-                    _ => Err(~"Can't cast this type")
+                    _ => Err(~"can't cast this type")
                 }
             }
         }
@@ -496,14 +496,14 @@ pub fn eval_const_expr_partial<T: ty::ExprTyProvider>(tcx: &T, e: &Expr)
       ExprPath(_) => {
           match lookup_const(tcx.ty_ctxt(), e) {
               Some(actual_e) => eval_const_expr_partial(&tcx.ty_ctxt(), actual_e),
-              None => Err(~"Non-constant path in constant expr")
+              None => Err(~"non-constant path in constant expr")
           }
       }
       ExprLit(lit) => Ok(lit_to_const(lit)),
       // If we have a vstore, just keep going; it has to be a string
       ExprVstore(e, _) => eval_const_expr_partial(tcx, e),
       ExprParen(e)     => eval_const_expr_partial(tcx, e),
-      _ => Err(~"Unsupported constant expr")
+      _ => Err(~"unsupported constant expr")
     }
 }
 
diff --git a/src/librustc/middle/dataflow.rs b/src/librustc/middle/dataflow.rs
index 6645450a970..e4b648dd43c 100644
--- a/src/librustc/middle/dataflow.rs
+++ b/src/librustc/middle/dataflow.rs
@@ -879,7 +879,7 @@ impl<'a, O:DataFlowOperator> PropagationContext<'a, O> {
                             None => {
                                 self.tcx().sess.span_bug(
                                     expr.span,
-                                    format!("No loop scope for id {:?}", loop_id));
+                                    format!("no loop scope for id {:?}", loop_id));
                             }
                         }
                     }
@@ -887,7 +887,7 @@ impl<'a, O:DataFlowOperator> PropagationContext<'a, O> {
                     r => {
                         self.tcx().sess.span_bug(
                             expr.span,
-                            format!("Bad entry `{:?}` in def_map for label", r));
+                            format!("bad entry `{:?}` in def_map for label", r));
                     }
                 }
             }
diff --git a/src/librustc/middle/liveness.rs b/src/librustc/middle/liveness.rs
index 26e4a11ae49..546d6f27204 100644
--- a/src/librustc/middle/liveness.rs
+++ b/src/librustc/middle/liveness.rs
@@ -328,7 +328,7 @@ impl IrMaps {
           Some(&var) => var,
           None => {
             self.tcx.sess.span_bug(
-                span, format!("No variable registered for id {}", node_id));
+                span, format!("no variable registered for id {}", node_id));
           }
         }
     }
@@ -627,7 +627,7 @@ impl Liveness {
             // code have to agree about which AST nodes are worth
             // creating liveness nodes for.
             self.tcx.sess.span_bug(
-                span, format!("No live node registered for node {}",
+                span, format!("no live node registered for node {}",
                            node_id));
           }
         }
@@ -759,7 +759,7 @@ impl Liveness {
                 let def_map = self.tcx.def_map.borrow();
                 match def_map.get().find(&id) {
                     Some(&DefLabel(loop_id)) => loop_id,
-                    _ => self.tcx.sess.span_bug(sp, "Label on break/loop \
+                    _ => self.tcx.sess.span_bug(sp, "label on break/loop \
                                                      doesn't refer to a loop")
                 }
             }
@@ -1152,7 +1152,7 @@ impl Liveness {
               match break_ln.get().find(&sc) {
                   Some(&b) => b,
                   None => self.tcx.sess.span_bug(expr.span,
-                                                 "Break to unknown label")
+                                                 "break to unknown label")
               }
           }
 
@@ -1167,7 +1167,7 @@ impl Liveness {
               match cont_ln.get().find(&sc) {
                   Some(&b) => b,
                   None => self.tcx.sess.span_bug(expr.span,
-                                                 "Loop to unknown label")
+                                                 "loop to unknown label")
               }
           }
 
diff --git a/src/librustc/middle/mem_categorization.rs b/src/librustc/middle/mem_categorization.rs
index 7c5d1439edf..f5e3ff5db34 100644
--- a/src/librustc/middle/mem_categorization.rs
+++ b/src/librustc/middle/mem_categorization.rs
@@ -548,7 +548,7 @@ impl mem_categorization_ctxt {
                   _ => {
                       self.tcx.sess.span_bug(
                           span,
-                          format!("Upvar of non-closure {:?} - {}",
+                          format!("upvar of non-closure {:?} - {}",
                                fn_node_id, ty.repr(self.tcx)));
                   }
               }
@@ -652,7 +652,7 @@ impl mem_categorization_ctxt {
             None => {
                 self.tcx.sess.span_bug(
                     node.span(),
-                    format!("Explicit deref of non-derefable type: {}",
+                    format!("explicit deref of non-derefable type: {}",
                          ty_to_str(self.tcx, base_cmt.ty)));
             }
         };
@@ -745,7 +745,7 @@ impl mem_categorization_ctxt {
           None => {
             self.tcx.sess.span_bug(
                 elt.span(),
-                format!("Explicit index of non-index type `{}`",
+                format!("explicit index of non-index type `{}`",
                      ty_to_str(self.tcx, base_cmt.ty)));
           }
         };
diff --git a/src/librustc/middle/region.rs b/src/librustc/middle/region.rs
index 9c11b89bb7e..86de1399acb 100644
--- a/src/librustc/middle/region.rs
+++ b/src/librustc/middle/region.rs
@@ -142,7 +142,7 @@ impl RegionMaps {
         let scope_map = self.scope_map.borrow();
         match scope_map.get().find(&id) {
             Some(&r) => r,
-            None => { fail!("No enclosing scope for id {}", id); }
+            None => { fail!("no enclosing scope for id {}", id); }
         }
     }
 
@@ -154,7 +154,7 @@ impl RegionMaps {
         let var_map = self.var_map.borrow();
         match var_map.get().find(&var_id) {
             Some(&r) => r,
-            None => { fail!("No enclosing scope for id {}", var_id); }
+            None => { fail!("no enclosing scope for id {}", var_id); }
         }
     }
 
@@ -554,7 +554,7 @@ fn resolve_local(visitor: &mut RegionResolutionVisitor,
         None => {
             visitor.sess.span_bug(
                 local.span,
-                "Local without enclosing block");
+                "local without enclosing block");
         }
     };
 
diff --git a/src/librustc/middle/resolve.rs b/src/librustc/middle/resolve.rs
index 6ee44c03a80..19e67bb865d 100644
--- a/src/librustc/middle/resolve.rs
+++ b/src/librustc/middle/resolve.rs
@@ -1378,7 +1378,7 @@ impl Resolver {
                     }
                     match method_map.get().find_mut(name) {
                         Some(s) => { s.insert(def_id); },
-                        _ => fail!("Can't happen"),
+                        _ => fail!("can't happen"),
                     }
                 }
 
@@ -1696,7 +1696,7 @@ impl Resolver {
                   }
                   match method_map.get().find_mut(name) {
                       Some(s) => { s.insert(def_id); },
-                      _ => fail!("Can't happen"),
+                      _ => fail!("can't happen"),
                   }
               }
 
@@ -3992,7 +3992,7 @@ impl Resolver {
                             self.resolve_error(field.span,
                                 format!("field `{}` is already declared", ident_str));
                             self.session.span_note(prev_field.span,
-                                "Previously declared here");
+                                "previously declared here");
                         },
                         None => {
                             ident_map.insert(ident, field);
@@ -4476,7 +4476,7 @@ impl Resolver {
                                       // in the same disjunct, which is an
                                       // error
                                      self.resolve_error(pattern.span,
-                                       format!("Identifier `{}` is bound more \
+                                       format!("identifier `{}` is bound more \
                                              than once in the same pattern",
                                             path_to_str(path, self.session
                                                         .intr())));
diff --git a/src/librustc/middle/resolve_lifetime.rs b/src/librustc/middle/resolve_lifetime.rs
index ead67f78063..ab730c1b2e5 100644
--- a/src/librustc/middle/resolve_lifetime.rs
+++ b/src/librustc/middle/resolve_lifetime.rs
@@ -297,7 +297,7 @@ impl LifetimeContext {
                        def: ast::DefRegion) {
         if lifetime_ref.id == ast::DUMMY_NODE_ID {
             self.sess.span_bug(lifetime_ref.span,
-                               "Lifetime reference not renumbered, \
+                               "lifetime reference not renumbered, \
                                probably a bug in syntax::fold");
         }
 
diff --git a/src/librustc/middle/trans/_match.rs b/src/librustc/middle/trans/_match.rs
index ad2e96702b0..f49b0f1af08 100644
--- a/src/librustc/middle/trans/_match.rs
+++ b/src/librustc/middle/trans/_match.rs
@@ -484,7 +484,7 @@ fn assert_is_binding_or_wild(bcx: &Block, p: @ast::Pat) {
     if !pat_is_binding_or_wild(bcx.tcx().def_map, p) {
         bcx.sess().span_bug(
             p.span,
-            format!("Expected an identifier pattern but found p: {}",
+            format!("expected an identifier pattern but found p: {}",
                  p.repr(bcx.tcx())));
     }
 }
diff --git a/src/librustc/middle/trans/adt.rs b/src/librustc/middle/trans/adt.rs
index 9d90fdb8011..15fbb54cd11 100644
--- a/src/librustc/middle/trans/adt.rs
+++ b/src/librustc/middle/trans/adt.rs
@@ -434,7 +434,7 @@ fn generic_type_of(cx: &CrateContext, r: &Repr, name: Option<&str>, sizing: bool
                                  Type::array(&Type::i64(), align_units),
                 a if a.population_count() == 1 => Type::array(&Type::vector(&Type::i32(), a / 4),
                                                               align_units),
-                _ => fail!("Unsupported enum alignment: {:?}", align)
+                _ => fail!("unsupported enum alignment: {:?}", align)
             };
             assert_eq!(machine::llalign_of_min(cx, pad_ty) as u64, align);
             assert_eq!(align % discr_size, 0);
diff --git a/src/librustc/middle/trans/callee.rs b/src/librustc/middle/trans/callee.rs
index 80d92d85686..77fe847f5f2 100644
--- a/src/librustc/middle/trans/callee.rs
+++ b/src/librustc/middle/trans/callee.rs
@@ -103,7 +103,7 @@ fn trans<'a>(bcx: &'a Block<'a>, expr: &ast::Expr) -> Callee<'a> {
             _ => {
                 bcx.tcx().sess.span_bug(
                     expr.span,
-                    format!("Type of callee is neither bare-fn nor closure: {}",
+                    format!("type of callee is neither bare-fn nor closure: {}",
                          bcx.ty_to_str(datum.ty)));
             }
         }
@@ -151,7 +151,7 @@ fn trans<'a>(bcx: &'a Block<'a>, expr: &ast::Expr) -> Callee<'a> {
             ast::DefSelfTy(..) | ast::DefMethod(..) => {
                 bcx.tcx().sess.span_bug(
                     ref_expr.span,
-                    format!("Cannot translate def {:?} \
+                    format!("cannot translate def {:?} \
                           to a callable thing!", def));
             }
         }
diff --git a/src/librustc/middle/trans/cleanup.rs b/src/librustc/middle/trans/cleanup.rs
index acbbdf27d1c..e28660ea01f 100644
--- a/src/librustc/middle/trans/cleanup.rs
+++ b/src/librustc/middle/trans/cleanup.rs
@@ -211,7 +211,7 @@ impl<'a> CleanupMethods<'a> for FunctionContext<'a> {
                 _ => {}
             }
         }
-        self.ccx.tcx.sess.bug("No loop scope found");
+        self.ccx.tcx.sess.bug("no loop scope found");
     }
 
     fn normal_exit_block(&'a self,
@@ -337,7 +337,7 @@ impl<'a> CleanupMethods<'a> for FunctionContext<'a> {
         }
 
         self.ccx.tcx.sess.bug(
-            format!("No cleanup scope {} found",
+            format!("no cleanup scope {} found",
                     ast_map::node_id_to_str(self.ccx.tcx.items, cleanup_scope,
                                             token::get_ident_interner())));
     }
@@ -548,7 +548,7 @@ impl<'a> CleanupHelperMethods<'a> for FunctionContext<'a> {
 
                     LoopExit(id, _) => {
                         self.ccx.tcx.sess.bug(format!(
-                                "Cannot exit from scope {:?}, \
+                                "cannot exit from scope {:?}, \
                                 not in scope", id));
                     }
                 }
diff --git a/src/librustc/middle/trans/common.rs b/src/librustc/middle/trans/common.rs
index 7ee77e4c0d6..7dbf159265d 100644
--- a/src/librustc/middle/trans/common.rs
+++ b/src/librustc/middle/trans/common.rs
@@ -472,7 +472,7 @@ impl<'a> Block<'a> {
             Some(&v) => v,
             None => {
                 self.tcx().sess.bug(format!(
-                    "No def associated with node id {:?}", nid));
+                    "no def associated with node id {:?}", nid));
             }
         }
     }
@@ -852,7 +852,7 @@ pub fn node_id_type_params(bcx: &Block, id: ast::NodeId) -> ~[ty::t] {
 
     if !params.iter().all(|t| !ty::type_needs_infer(*t)) {
         bcx.sess().bug(
-            format!("Type parameters for node {} include inference types: {}",
+            format!("type parameters for node {} include inference types: {}",
                  id, params.map(|t| bcx.ty_to_str(*t)).connect(",")));
     }
 
diff --git a/src/librustc/middle/trans/consts.rs b/src/librustc/middle/trans/consts.rs
index a8b0da80266..760c56dd945 100644
--- a/src/librustc/middle/trans/consts.rs
+++ b/src/librustc/middle/trans/consts.rs
@@ -146,14 +146,14 @@ fn const_deref(cx: &CrateContext, v: ValueRef, t: ty::t, explicit: bool)
                     const_deref_newtype(cx, v, t)
                 }
                 _ => {
-                    cx.sess.bug(format!("Unexpected dereferenceable type {}",
+                    cx.sess.bug(format!("unexpected dereferenceable type {}",
                                      ty_to_str(cx.tcx, t)))
                 }
             };
             (dv, mt.ty)
         }
         None => {
-            cx.sess.bug(format!("Can't dereference const of type {}",
+            cx.sess.bug(format!("can't dereference const of type {}",
                              ty_to_str(cx.tcx, t)))
         }
     }
diff --git a/src/librustc/middle/trans/debuginfo.rs b/src/librustc/middle/trans/debuginfo.rs
index 7bbbf4f9905..d214a192ed8 100644
--- a/src/librustc/middle/trans/debuginfo.rs
+++ b/src/librustc/middle/trans/debuginfo.rs
@@ -298,7 +298,7 @@ pub fn create_local_var_metadata(bcx: &Block, local: &ast::Local) {
                 Some(datum) => datum,
                 None => {
                     bcx.tcx().sess.span_bug(span,
-                        format!("No entry in lllocals table for {:?}",
+                        format!("no entry in lllocals table for {:?}",
                                 node_id));
                 }
             }
@@ -440,7 +440,7 @@ pub fn create_argument_metadata(bcx: &Block, arg: &ast::Arg) {
                 Some(v) => v,
                 None => {
                     bcx.tcx().sess.span_bug(span,
-                        format!("No entry in llargs table for {:?}",
+                        format!("no entry in llargs table for {:?}",
                                 node_id));
                 }
             }
diff --git a/src/librustc/middle/trans/foreign.rs b/src/librustc/middle/trans/foreign.rs
index bc9dd767ec6..cb638e99ab7 100644
--- a/src/librustc/middle/trans/foreign.rs
+++ b/src/librustc/middle/trans/foreign.rs
@@ -81,17 +81,17 @@ pub fn llvm_calling_convention(ccx: &CrateContext,
         match abi {
             RustIntrinsic => {
                 // Intrinsics are emitted by monomorphic fn
-                ccx.sess.bug(format!("Asked to register intrinsic fn"));
+                ccx.sess.bug(format!("asked to register intrinsic fn"));
             }
 
             Rust => {
                 // FIXME(#3678) Implement linking to foreign fns with Rust ABI
                 ccx.sess.unimpl(
-                    format!("Foreign functions with Rust ABI"));
+                    format!("foreign functions with Rust ABI"));
             }
 
             // It's the ABI's job to select this, not us.
-            System => ccx.sess.bug("System abi should be selected elsewhere"),
+            System => ccx.sess.bug("system abi should be selected elsewhere"),
 
             Stdcall => lib::llvm::X86StdcallCallConv,
             Fastcall => lib::llvm::X86FastcallCallConv,
@@ -365,7 +365,7 @@ pub fn trans_foreign_mod(ccx: @CrateContext,
                             (abis, (*path).clone())
                         }
                         _ => {
-                            fail!("Unable to find foreign item in tcx.items \
+                            fail!("unable to find foreign item in tcx.items \
                                    table.")
                         }
                     };
diff --git a/src/librustc/middle/trans/intrinsic.rs b/src/librustc/middle/trans/intrinsic.rs
index 25ecbeaa9a5..653f56c6de3 100644
--- a/src/librustc/middle/trans/intrinsic.rs
+++ b/src/librustc/middle/trans/intrinsic.rs
@@ -227,7 +227,7 @@ pub fn trans_intrinsic(ccx: @CrateContext,
                 "acq"     => lib::llvm::Acquire,
                 "rel"     => lib::llvm::Release,
                 "acqrel"  => lib::llvm::AcquireRelease,
-                _ => ccx.sess.fatal("Unknown ordering in atomic intrinsic")
+                _ => ccx.sess.fatal("unknown ordering in atomic intrinsic")
             }
         };
 
@@ -268,7 +268,7 @@ pub fn trans_intrinsic(ccx: @CrateContext,
                     "min"   => lib::llvm::Min,
                     "umax"  => lib::llvm::UMax,
                     "umin"  => lib::llvm::UMin,
-                    _ => ccx.sess.fatal("Unknown atomic operation")
+                    _ => ccx.sess.fatal("unknown atomic operation")
                 };
 
                 let old = AtomicRMW(bcx, atom_op, get_param(decl, first_real_arg),
diff --git a/src/librustc/middle/trans/monomorphize.rs b/src/librustc/middle/trans/monomorphize.rs
index 25c536f2a6d..61100220ffb 100644
--- a/src/librustc/middle/trans/monomorphize.rs
+++ b/src/librustc/middle/trans/monomorphize.rs
@@ -98,7 +98,7 @@ pub fn monomorphic_fn(ccx: @CrateContext,
         session::expect(
             ccx.sess,
             ccx.tcx.items.find(fn_id.node),
-            || format!("While monomorphizing {:?}, couldn't find it in the \
+            || format!("while monomorphizing {:?}, couldn't find it in the \
                         item map (may have attempted to monomorphize an item \
                         defined in a different crate?)", fn_id))
     };
@@ -286,7 +286,7 @@ pub fn monomorphic_fn(ccx: @CrateContext,
                     d
                 }
                 _ => {
-                    ccx.tcx.sess.bug(format!("Can't monomorphize a {:?}",
+                    ccx.tcx.sess.bug(format!("can't monomorphize a {:?}",
                                              map_node))
                 }
             }
@@ -310,7 +310,7 @@ pub fn monomorphic_fn(ccx: @CrateContext,
         ast_map::NodeBlock(..) |
         ast_map::NodeCalleeScope(..) |
         ast_map::NodeLocal(..) => {
-            ccx.tcx.sess.bug(format!("Can't monomorphize a {:?}", map_node))
+            ccx.tcx.sess.bug(format!("can't monomorphize a {:?}", map_node))
         }
     };
 
diff --git a/src/librustc/middle/trans/reflect.rs b/src/librustc/middle/trans/reflect.rs
index 8c2047a5fc5..1a1ae97bbcd 100644
--- a/src/librustc/middle/trans/reflect.rs
+++ b/src/librustc/middle/trans/reflect.rs
@@ -95,7 +95,7 @@ impl<'a> Reflector<'a> {
         let tcx = self.bcx.tcx();
         let mth_idx = ty::method_idx(
             tcx.sess.ident_of(~"visit_" + ty_name),
-            *self.visitor_methods).expect(format!("Couldn't find visit method \
+            *self.visitor_methods).expect(format!("couldn't find visit method \
                                                 for {}", ty_name));
         let mth_ty =
             ty::mk_bare_fn(tcx, self.visitor_methods[mth_idx].fty.clone());
diff --git a/src/librustc/middle/trans/tvec.rs b/src/librustc/middle/trans/tvec.rs
index a0a1ff20a9a..c8180362bc5 100644
--- a/src/librustc/middle/trans/tvec.rs
+++ b/src/librustc/middle/trans/tvec.rs
@@ -404,7 +404,7 @@ pub fn write_content<'a>(
                 }
                 _ => {
                     bcx.tcx().sess.span_bug(content_expr.span,
-                                            "Unexpected evec content");
+                                            "unexpected evec content");
                 }
             }
         }
@@ -465,7 +465,7 @@ pub fn write_content<'a>(
         }
         _ => {
             bcx.tcx().sess.span_bug(content_expr.span,
-                                    "Unexpected vec content");
+                                    "unexpected vec content");
         }
     }
 }
@@ -498,7 +498,7 @@ pub fn elements_required(bcx: &Block, content_expr: &ast::Expr) -> uint {
                 ast::LitStr(ref s, _) => s.get().len(),
                 _ => {
                     bcx.tcx().sess.span_bug(content_expr.span,
-                                            "Unexpected evec content")
+                                            "unexpected evec content")
                 }
             }
         },
@@ -507,7 +507,7 @@ pub fn elements_required(bcx: &Block, content_expr: &ast::Expr) -> uint {
             ty::eval_repeat_count(&bcx.tcx(), count_expr)
         }
         _ => bcx.tcx().sess.span_bug(content_expr.span,
-                                     "Unexpected vec content")
+                                     "unexpected vec content")
     }
 }
 
diff --git a/src/librustc/middle/ty.rs b/src/librustc/middle/ty.rs
index 1ff6da63fea..7b2aee9274a 100644
--- a/src/librustc/middle/ty.rs
+++ b/src/librustc/middle/ty.rs
@@ -2101,7 +2101,7 @@ pub fn type_contents(cx: ctxt, ty: t) -> TypeContents {
             ty_type => TC::None,
 
             ty_err => {
-                cx.sess.bug("Asked to compute contents of error type");
+                cx.sess.bug("asked to compute contents of error type");
             }
         };
 
@@ -2926,7 +2926,7 @@ pub fn adjust_ty(cx: ctxt,
                                 None => {
                                     cx.sess.span_bug(
                                         span,
-                                        format!("The {}th autoderef failed: \
+                                        format!("the {}th autoderef failed: \
                                                 {}",
                                                 i,
                                                 ty_to_str(cx, adjusted_ty)));
@@ -3132,7 +3132,7 @@ pub fn resolve_expr(tcx: ctxt, expr: &ast::Expr) -> ast::Def {
         Some(&def) => def,
         None => {
             tcx.sess.span_bug(expr.span, format!(
-                "No def-map entry for expr {:?}", expr.id));
+                "no def-map entry for expr {:?}", expr.id));
         }
     }
 }
@@ -3209,7 +3209,7 @@ pub fn expr_kind(tcx: ctxt,
 
                 def => {
                     tcx.sess.span_bug(expr.span, format!(
-                        "Uncategorized def for expr {:?}: {:?}",
+                        "uncategorized def for expr {:?}: {:?}",
                         expr.id, def));
                 }
             }
@@ -3335,7 +3335,7 @@ pub fn field_idx_strict(tcx: ty::ctxt, name: ast::Name, fields: &[field])
     for f in fields.iter() { if f.ident.name == name { return i; } i += 1u; }
     let string = token::get_ident(name);
     tcx.sess.bug(format!(
-        "No field named `{}` found in the list of fields `{:?}`",
+        "no field named `{}` found in the list of fields `{:?}`",
         string.get(),
         fields.map(|f| tcx.sess.str_of(f.ident))));
 }
@@ -3687,7 +3687,7 @@ fn lookup_locally_or_in_crate_store<V:Clone>(
     }
 
     if def_id.crate == ast::LOCAL_CRATE {
-        fail!("No def'n found for {:?} in tcx.{}", def_id, descr);
+        fail!("no def'n found for {:?} in tcx.{}", def_id, descr);
     }
     let v = load_external();
     map.insert(def_id, v.clone());
diff --git a/src/librustc/middle/typeck/check/method.rs b/src/librustc/middle/typeck/check/method.rs
index 2463bf679d0..f19ca049368 100644
--- a/src/librustc/middle/typeck/check/method.rs
+++ b/src/librustc/middle/typeck/check/method.rs
@@ -789,7 +789,7 @@ impl<'a> LookupContext<'a> {
             ty_err => None,
 
             ty_unboxed_vec(_) | ty_type | ty_infer(TyVar(_)) => {
-                self.bug(format!("Unexpected type: {}",
+                self.bug(format!("unexpected type: {}",
                               self.ty_to_str(self_ty)));
             }
         }
diff --git a/src/librustc/middle/typeck/check/mod.rs b/src/librustc/middle/typeck/check/mod.rs
index 81948464d53..2332152a5d7 100644
--- a/src/librustc/middle/typeck/check/mod.rs
+++ b/src/librustc/middle/typeck/check/mod.rs
@@ -517,9 +517,9 @@ pub fn check_no_duplicate_fields(tcx: ty::ctxt,
         let orig_sp = field_names.find(&id).map(|x| *x);
         match orig_sp {
             Some(orig_sp) => {
-                tcx.sess.span_err(sp, format!("Duplicate field name {} in record type declaration",
+                tcx.sess.span_err(sp, format!("duplicate field name {} in record type declaration",
                                               tcx.sess.str_of(id)));
-                tcx.sess.span_note(orig_sp, "First declaration of this field occurred here");
+                tcx.sess.span_note(orig_sp, "first declaration of this field occurred here");
                 break;
             }
             None => {
@@ -1006,7 +1006,7 @@ impl FnCtxt {
             None => {
                 self.tcx().sess.span_bug(
                     span,
-                    format!("No type for local variable {:?}", nid));
+                    format!("no type for local variable {:?}", nid));
             }
         }
     }
@@ -1619,7 +1619,7 @@ pub fn check_expr_with_unifier(fcx: @FnCtxt,
                 _ => {
                     fcx.tcx().sess.span_bug(
                         sp,
-                        format!("Method without bare fn type"));
+                        format!("method without bare fn type"));
                 }
             }
         }
diff --git a/src/librustc/middle/typeck/check/regionck.rs b/src/librustc/middle/typeck/check/regionck.rs
index 1a45a1d5491..ac15d52ff13 100644
--- a/src/librustc/middle/typeck/check/regionck.rs
+++ b/src/librustc/middle/typeck/check/regionck.rs
@@ -473,7 +473,7 @@ fn check_expr_fn_block(rcx: &mut Rcx,
         _ => {
             tcx.sess.span_bug(
                 expr.span,
-                "Expected expr_fn_block");
+                "expected expr_fn_block");
         }
     }
 }
@@ -1189,7 +1189,7 @@ pub mod guarantor {
                 None => {
                     tcx.sess.span_bug(
                         expr.span,
-                        format!("Autoderef but type not derefable: {}",
+                        format!("autoderef but type not derefable: {}",
                              ty_to_str(tcx, ct.ty)));
                 }
             }
diff --git a/src/librustc/middle/typeck/collect.rs b/src/librustc/middle/typeck/collect.rs
index c1a6e53069e..5e46daad7ee 100644
--- a/src/librustc/middle/typeck/collect.rs
+++ b/src/librustc/middle/typeck/collect.rs
@@ -430,7 +430,7 @@ pub fn ensure_supertraits(ccx: &CrateCtxt,
             if ty_trait_refs.iter().any(|other_trait| other_trait.def_id == trait_ref.def_id) {
                 // This means a trait inherited from the same supertrait more
                 // than once.
-                tcx.sess.span_err(sp, "Duplicate supertrait in trait declaration");
+                tcx.sess.span_err(sp, "duplicate supertrait in trait declaration");
                 break;
             } else {
                 ty_trait_refs.push(trait_ref);
@@ -891,7 +891,7 @@ pub fn ty_of_item(ccx: &CrateCtxt, it: &ast::Item)
         ast::ItemTrait(..) => {
             tcx.sess.span_bug(
                 it.span,
-                format!("Invoked ty_of_item on trait"));
+                format!("invoked ty_of_item on trait"));
         }
         ast::ItemStruct(_, ref generics) => {
             let ty_generics = ty_generics(ccx, generics, 0);
diff --git a/src/librustc/middle/typeck/infer/coercion.rs b/src/librustc/middle/typeck/infer/coercion.rs
index 0db17c8148e..d8166108947 100644
--- a/src/librustc/middle/typeck/infer/coercion.rs
+++ b/src/librustc/middle/typeck/infer/coercion.rs
@@ -202,7 +202,7 @@ impl<'f> Coerce<'f> {
             Err(e) => {
                 self.get_ref().infcx.tcx.sess.span_bug(
                     self.get_ref().trace.origin.span(),
-                    format!("Failed to resolve even without \
+                    format!("failed to resolve even without \
                           any force options: {:?}", e));
             }
         }
diff --git a/src/librustc/middle/typeck/infer/lattice.rs b/src/librustc/middle/typeck/infer/lattice.rs
index d96cf84eb13..fa40fa6a064 100644
--- a/src/librustc/middle/typeck/infer/lattice.rs
+++ b/src/librustc/middle/typeck/infer/lattice.rs
@@ -528,7 +528,7 @@ pub fn var_ids<T:Combine>(this: &T,
             r => {
                 this.infcx().tcx.sess.span_bug(
                     this.trace().origin.span(),
-                    format!("Found non-region-vid: {:?}", r));
+                    format!("found non-region-vid: {:?}", r));
             }
         }).collect()
 }
diff --git a/src/librustc/middle/typeck/infer/region_inference/mod.rs b/src/librustc/middle/typeck/infer/region_inference/mod.rs
index 54998e06f8e..2bc0d7d6419 100644
--- a/src/librustc/middle/typeck/infer/region_inference/mod.rs
+++ b/src/librustc/middle/typeck/infer/region_inference/mod.rs
@@ -233,7 +233,7 @@ impl RegionVarBindings {
         self.bound_count.set(sc + 1);
 
         if sc >= self.bound_count.get() {
-            self.tcx.sess.bug("Rollover in RegionInference new_bound()");
+            self.tcx.sess.bug("rollover in RegionInference new_bound()");
         }
 
         ReLateBound(binder_id, BrFresh(sc))
@@ -278,7 +278,7 @@ impl RegionVarBindings {
           (_, ReLateBound(..)) => {
             self.tcx.sess.span_bug(
                 origin.span(),
-                format!("Cannot relate bound region: {} <= {}",
+                format!("cannot relate bound region: {} <= {}",
                         sub.repr(self.tcx),
                         sup.repr(self.tcx)));
           }
@@ -351,7 +351,7 @@ impl RegionVarBindings {
                 let var_origins = self.var_origins.borrow();
                 self.tcx.sess.span_bug(
                     var_origins.get()[rid.to_uint()].span(),
-                    format!("Attempt to resolve region variable before \
+                    format!("attempt to resolve region variable before \
                              values have been computed!"))
             }
             Some(ref values) => values[rid.to_uint()]
@@ -544,7 +544,7 @@ impl RegionVarBindings {
           (ReEarlyBound(..), _) |
           (_, ReEarlyBound(..)) => {
             self.tcx.sess.bug(
-                format!("Cannot relate bound region: LUB({}, {})",
+                format!("cannot relate bound region: LUB({}, {})",
                         a.repr(self.tcx),
                         b.repr(self.tcx)));
           }
@@ -646,7 +646,7 @@ impl RegionVarBindings {
             (ReEarlyBound(..), _) |
             (_, ReEarlyBound(..)) => {
               self.tcx.sess.bug(
-                  format!("Cannot relate bound region: GLB({}, {})",
+                  format!("cannot relate bound region: GLB({}, {})",
                           a.repr(self.tcx),
                           b.repr(self.tcx)));
             }
diff --git a/src/librustc/middle/typeck/infer/test.rs b/src/librustc/middle/typeck/infer/test.rs
index dd96018d4af..517fe232b03 100644
--- a/src/librustc/middle/typeck/infer/test.rs
+++ b/src/librustc/middle/typeck/infer/test.rs
@@ -97,7 +97,7 @@ impl Env {
         return match search_mod(self, &self.crate.node.module, 0, names) {
             Some(id) => id,
             None => {
-                fail!("No item found: `%s`", names.connect("::"));
+                fail!("no item found: `%s`", names.connect("::"));
             }
         };
 
@@ -230,7 +230,7 @@ impl Env {
             for msg in self.err_messages.iter() {
                 debug!("Error encountered: %s", *msg);
             }
-            format!("Resolving regions encountered %u errors but expected %u!",
+            format!("resolving regions encountered %u errors but expected %u!",
                  self.err_messages.len(),
                  exp_count);
         }
@@ -240,7 +240,7 @@ impl Env {
     pub fn check_lub(&self, t1: ty::t, t2: ty::t, t_lub: ty::t) {
         match self.lub().tys(t1, t2) {
             Err(e) => {
-                fail!("Unexpected error computing LUB: %?", e)
+                fail!("unexpected error computing LUB: %?", e)
             }
             Ok(t) => {
                 self.assert_eq(t, t_lub);
@@ -262,7 +262,7 @@ impl Env {
                self.ty_to_str(t_glb));
         match self.glb().tys(t1, t2) {
             Err(e) => {
-                fail!("Unexpected error computing LUB: %?", e)
+                fail!("unexpected error computing LUB: %?", e)
             }
             Ok(t) => {
                 self.assert_eq(t, t_glb);
@@ -281,7 +281,7 @@ impl Env {
         match self.lub().tys(t1, t2) {
             Err(_) => {}
             Ok(t) => {
-                fail!("Unexpected success computing LUB: %?", self.ty_to_str(t))
+                fail!("unexpected success computing LUB: %?", self.ty_to_str(t))
             }
         }
     }
@@ -291,7 +291,7 @@ impl Env {
         match self.glb().tys(t1, t2) {
             Err(_) => {}
             Ok(t) => {
-                fail!("Unexpected success computing GLB: %?", self.ty_to_str(t))
+                fail!("unexpected success computing GLB: %?", self.ty_to_str(t))
             }
         }
     }
diff --git a/src/librustc/middle/typeck/variance.rs b/src/librustc/middle/typeck/variance.rs
index 51364addfed..e29add4bc95 100644
--- a/src/librustc/middle/typeck/variance.rs
+++ b/src/librustc/middle/typeck/variance.rs
@@ -718,7 +718,7 @@ impl<'a> ConstraintContext<'a> {
             ty::ty_infer(..) | ty::ty_err |
             ty::ty_type | ty::ty_unboxed_vec(..) => {
                 self.tcx().sess.bug(
-                    format!("Unexpected type encountered in \
+                    format!("unexpected type encountered in \
                             variance inference: {}",
                             ty.repr(self.tcx())));
             }
@@ -804,7 +804,7 @@ impl<'a> ConstraintContext<'a> {
             ty::ReEmpty => {
                 // We don't expect to see anything but 'static or bound
                 // regions when visiting member types or method types.
-                self.tcx().sess.bug(format!("Unexpected region encountered in \
+                self.tcx().sess.bug(format!("unexpected region encountered in \
                                             variance inference: {}",
                                             region.repr(self.tcx())));
             }
diff --git a/src/librustc/util/sha2.rs b/src/librustc/util/sha2.rs
index 74fefe41683..5fbf57c5060 100644
--- a/src/librustc/util/sha2.rs
+++ b/src/librustc/util/sha2.rs
@@ -64,12 +64,12 @@ fn add_bytes_to_bits<T: Int + CheckedAdd + ToBits>(bits: T, bytes: T) -> T {
     let (new_high_bits, new_low_bits) = bytes.to_bits();
 
     if new_high_bits > Zero::zero() {
-        fail!("Numeric overflow occured.")
+        fail!("numeric overflow occured.")
     }
 
     match bits.checked_add(&new_low_bits) {
         Some(x) => return x,
-        None => fail!("Numeric overflow occured.")
+        None => fail!("numeric overflow occured.")
     }
 }