Make a lexer error message friendlier

src/boot/fe/lexer.mll

@@ -297,7 +297,8 @@ rule token = parse
 | '\''                         { char lexbuf                       }
 | '"'                          { let buf = Buffer.create 32 in
                                    str buf lexbuf                  }
-
+| _ as c                       { let s = Char.escaped c in
+                                   fail lexbuf ("Bad character: " ^ s) }
 | eof                          { EOF        }
 
 and str buf = parse

src/comp/front/lexer.rs

@@ -388,7 +388,7 @@ impure fn scan_number(mutable char c, reader rdr) -> token.token {
     } else {
         accum_int = scan_dec_digits(rdr);
     }
-
+        
     c = rdr.curr();
     n = rdr.next();
 
@@ -443,6 +443,7 @@ impure fn scan_number(mutable char c, reader rdr) -> token.token {
         }
     }
     c = rdr.curr();
+
     if (c == '.') {
         // Parse a floating-point number.
         rdr.bump();

src/comp/middle/trans.rs

@@ -4594,6 +4594,7 @@ fn trans_log(@block_ctxt cx, @ast.expr e) -> result {
 
     auto sub = trans_expr(cx, e);
     auto e_ty = ty.expr_ty(e);
+
     if (ty.type_is_fp(e_ty)) {
         let TypeRef tr;
         let bool is32bit = false;