diff --git a/src/rustc/middle/alias.rs b/src/rustc/middle/alias.rs
index 1fb17d4f385..7b25a0955f3 100644
--- a/src/rustc/middle/alias.rs
+++ b/src/rustc/middle/alias.rs
@@ -2,6 +2,7 @@ import syntax::{ast, ast_util, ast_map};
 import ast_util::path_to_ident;
 import ast::{ident, fn_ident, node_id};
 import syntax::codemap::span;
+import syntax::print::pprust::expr_to_str;
 import syntax::visit;
 import visit::vt;
 import std::list;
@@ -703,7 +704,7 @@ fn expr_root(cx: ctx, ex: @ast::expr, autoderef: bool)
                     }
                   }
                   ty::ty_class(did, _) {
-                    util::common::log_expr(*base);
+                    #debug["base: %s", expr_to_str(base)];
                     let in_self = alt ctor_self {
                       some(selfid) {
                         alt tcx.def_map.find(base.id) {
diff --git a/src/rustc/middle/resolve.rs b/src/rustc/middle/resolve.rs
index d8a47a5e3a0..1eeb0b0821e 100644
--- a/src/rustc/middle/resolve.rs
+++ b/src/rustc/middle/resolve.rs
@@ -8,7 +8,7 @@ import pat_util::*;
 import syntax::attr;
 import metadata::{csearch, cstore};
 import driver::session::session;
-import util::common::*;
+import util::common::is_main_name;
 import std::map::{int_hash, str_hash, hashmap};
 import vec::each;
 import syntax::codemap::span;
diff --git a/src/rustc/middle/trans/base.rs b/src/rustc/middle/trans/base.rs
index cb17f199731..61d0786b215 100644
--- a/src/rustc/middle/trans/base.rs
+++ b/src/rustc/middle/trans/base.rs
@@ -28,7 +28,7 @@ import syntax::codemap::span;
 import syntax::print::pprust::{expr_to_str, stmt_to_str, path_to_str};
 import pat_util::*;
 import visit::vt;
-import util::common::*;
+import util::common::is_main_name;
 import lib::llvm::{llvm, mk_target_data, mk_type_names};
 import lib::llvm::{ModuleRef, ValueRef, TypeRef, BasicBlockRef};
 import lib::llvm::{True, False};
@@ -1696,7 +1696,7 @@ fn trans_eager_binop(cx: block, op: ast::binop, lhs: ValueRef,
 
 fn trans_assign_op(bcx: block, ex: @ast::expr, op: ast::binop,
                    dst: @ast::expr, src: @ast::expr) -> block {
-    log_expr(*ex);
+    #debug["%s", expr_to_str(ex)];
     let _icx = bcx.insn_ctxt("trans_assign_op");
     let t = expr_ty(bcx, src);
     let lhs_res = trans_lval(bcx, dst);
diff --git a/src/rustc/middle/trans/common.rs b/src/rustc/middle/trans/common.rs
index da650eea792..dce90a51db2 100644
--- a/src/rustc/middle/trans/common.rs
+++ b/src/rustc/middle/trans/common.rs
@@ -11,7 +11,6 @@ import driver::session;
 import session::session;
 import middle::{resolve, ty};
 import back::{link, abi, upcall};
-import util::common::*;
 import syntax::codemap::span;
 import lib::llvm::{llvm, target_data, type_names, associate_type,
                    name_has_type};
diff --git a/src/rustc/middle/trans/shape.rs b/src/rustc/middle/trans/shape.rs
index 72eda246db2..7be5bfe2c68 100644
--- a/src/rustc/middle/trans/shape.rs
+++ b/src/rustc/middle/trans/shape.rs
@@ -13,7 +13,6 @@ import middle::ty::field;
 import syntax::ast;
 import syntax::ast_util::{dummy_sp, new_def_hash};
 import syntax::util::interner;
-import util::common;
 import util::ppaux::ty_to_str;
 import syntax::codemap::span;
 import dvec::{dvec, extensions};
diff --git a/src/rustc/middle/tstate/annotate.rs b/src/rustc/middle/tstate/annotate.rs
index 791c1aa6924..0db63a4ac26 100644
--- a/src/rustc/middle/tstate/annotate.rs
+++ b/src/rustc/middle/tstate/annotate.rs
@@ -2,7 +2,7 @@
 import syntax::ast::*;
 import syntax::visit;
 import syntax::codemap::span;
-import util::common::{log_stmt};
+import syntax::print::pprust::stmt_to_str;
 import aux::{num_constraints, get_fn_info, crate_ctxt, add_node};
 import ann::empty_ann;
 import pat_util::pat_binding_ids;
@@ -14,8 +14,8 @@ fn collect_ids_block(b: blk, rs: @mut [node_id]) { *rs += [b.node.id]; }
 fn collect_ids_stmt(s: @stmt, rs: @mut [node_id]) {
     alt s.node {
       stmt_decl(_, id) | stmt_expr(_, id) | stmt_semi(_, id) {
-        log(debug, "node_id " + int::str(id));
-        log_stmt(*s);
+        #debug["node_id %s", int::str(id)];
+        #debug["%s", stmt_to_str(*s)];
         *rs += [id];
       }
     }
diff --git a/src/rustc/middle/tstate/bitvectors.rs b/src/rustc/middle/tstate/bitvectors.rs
index 714efaa471a..c3a38ac35eb 100644
--- a/src/rustc/middle/tstate/bitvectors.rs
+++ b/src/rustc/middle/tstate/bitvectors.rs
@@ -10,7 +10,6 @@ import tstate::ann::{pre_and_post, precond, postcond, prestate, poststate,
                      clear_in_poststate, clear_in_prestate,
                      clear_in_poststate_};
 import tritv::*;
-import util::common::*;
 import driver::session::session;
 import std::map::hashmap;
 
diff --git a/src/rustc/middle/tstate/ck.rs b/src/rustc/middle/tstate/ck.rs
index a200a05d179..64936ec37e5 100644
--- a/src/rustc/middle/tstate/ck.rs
+++ b/src/rustc/middle/tstate/ck.rs
@@ -14,6 +14,7 @@ import annotate::annotate_crate;
 import collect_locals::mk_f_to_fn_info;
 import pre_post_conditions::fn_pre_post;
 import states::find_pre_post_state_fn;
+import syntax::print::pprust::expr_to_str;
 import driver::session::session;
 import std::map::hashmap;
 
@@ -23,16 +24,6 @@ fn check_states_expr(e: @expr, fcx: fn_ctxt, v: visit::vt<fn_ctxt>) {
     let prec: precond = expr_precond(fcx.ccx, e);
     let pres: prestate = expr_prestate(fcx.ccx, e);
 
-
-    /*
-    log_err("check_states_expr:");
-      util::common::log_expr_err(*e);
-      log_err("prec = ");
-      log_tritv_err(fcx, prec);
-      log_err("pres = ");
-      log_tritv_err(fcx, pres);
-    */
-
     if !implies(pres, prec) {
         let mut s = "";
         let diff = first_difference_string(fcx, prec, pres);
@@ -55,7 +46,6 @@ fn check_states_stmt(s: @stmt, fcx: fn_ctxt, v: visit::vt<fn_ctxt>) {
     let prec: precond = ann_precond(a);
     let pres: prestate = ann_prestate(a);
 
-
     #debug("check_states_stmt:");
     log(debug, print::pprust::stmt_to_str(*s));
     #debug("prec = ");
diff --git a/src/rustc/middle/tstate/pre_post_conditions.rs b/src/rustc/middle/tstate/pre_post_conditions.rs
index 062ec0f38f8..a51a4f72a0e 100644
--- a/src/rustc/middle/tstate/pre_post_conditions.rs
+++ b/src/rustc/middle/tstate/pre_post_conditions.rs
@@ -8,9 +8,9 @@ import tritv::*;
 import pat_util::*;
 import syntax::ast::*;
 import syntax::ast_util::*;
+import syntax::print::pprust::{expr_to_str, stmt_to_str};
 import syntax::visit;
-import util::common::{log_expr, field_exprs,
-                      has_nonlocal_exits, log_stmt};
+import util::common::{field_exprs, has_nonlocal_exits};
 import syntax::codemap::span;
 import driver::session::session;
 import std::map::hashmap;
@@ -73,8 +73,7 @@ fn find_pre_post_item(ccx: crate_ctxt, i: item) {
    be the union of all postconditions for <args> */
 fn find_pre_post_exprs(fcx: fn_ctxt, args: [@expr], id: node_id) {
     if vec::len::<@expr>(args) > 0u {
-        #debug("find_pre_post_exprs: oper =");
-        log_expr(*args[0]);
+        #debug["find_pre_post_exprs: oper = %s", expr_to_str(args[0])];
     }
     fn do_one(fcx: fn_ctxt, e: @expr) { find_pre_post_expr(fcx, e); }
     for args.each {|e| do_one(fcx, e); }
@@ -473,8 +472,7 @@ fn find_pre_post_expr(fcx: fn_ctxt, e: @expr) {
 }
 
 fn find_pre_post_stmt(fcx: fn_ctxt, s: stmt) {
-    #debug("stmt =");
-    log_stmt(s);
+    #debug["stmt = %s", stmt_to_str(s)];
     alt s.node {
       stmt_decl(adecl, id) {
         alt adecl.node {
@@ -571,12 +569,6 @@ fn find_pre_post_block(fcx: fn_ctxt, b: blk) {
     let nv = num_constraints(fcx.enclosing);
     fn do_one_(fcx: fn_ctxt, s: @stmt) {
         find_pre_post_stmt(fcx, *s);
-        /*
-                #error("pre_post for stmt:");
-                log_stmt_err(*s);
-                #error("is:");
-                log_pp_err(stmt_pp(fcx.ccx, *s));
-        */
     }
     for b.node.stmts.each {|s| do_one_(fcx, s); }
     fn do_inner_(fcx: fn_ctxt, &&e: @expr) { find_pre_post_expr(fcx, e); }
diff --git a/src/rustc/middle/tstate/states.rs b/src/rustc/middle/tstate/states.rs
index c5a4e1c5815..89932070a0c 100644
--- a/src/rustc/middle/tstate/states.rs
+++ b/src/rustc/middle/tstate/states.rs
@@ -7,9 +7,10 @@ import bitvectors::*;
 import pat_util::*;
 import syntax::ast::*;
 import syntax::ast_util::*;
+import syntax::print::pprust::{expr_to_str, stmt_to_str};
 import syntax::codemap::span;
 import middle::ty::{expr_ty, type_is_bot};
-import util::common::*;
+import util::common::{field_exprs, has_nonlocal_exits, may_break};
 import driver::session::session;
 import std::map::hashmap;
 
@@ -204,21 +205,6 @@ fn join_then_else(fcx: fn_ctxt, antec: @expr, conseq: blk,
         set_prestate_ann(fcx.ccx, id, pres) |
             find_pre_post_state_expr(fcx, pres, antec);
 
-    /*
-    log_err("join_then_else:");
-    log_expr_err(*antec);
-    log_bitv_err(fcx, expr_prestate(fcx.ccx, antec));
-    log_bitv_err(fcx, expr_poststate(fcx.ccx, antec));
-    log_block_err(conseq);
-    log_bitv_err(fcx, block_prestate(fcx.ccx, conseq));
-    log_bitv_err(fcx, block_poststate(fcx.ccx, conseq));
-    log_err("****");
-    log_bitv_err(fcx, expr_precond(fcx.ccx, antec));
-    log_bitv_err(fcx, expr_postcond(fcx.ccx, antec));
-    log_bitv_err(fcx, block_precond(fcx.ccx, conseq));
-    log_bitv_err(fcx, block_postcond(fcx.ccx, conseq));
-    */
-
     alt maybe_alt {
       none {
         alt chk {
@@ -313,8 +299,7 @@ fn find_pre_post_state_expr(fcx: fn_ctxt, pres: prestate, e: @expr) -> bool {
                                       return_val);
       }
       expr_call(operator, operands, _) {
-          #debug("hey it's a call");
-          log_expr(*e);
+        #debug["hey it's a call: %s", expr_to_str(e)];
         ret find_pre_post_state_call(fcx, pres, operator, e.id,
                                      callee_arg_init_ops(fcx, operator.id),
                                      operands,
@@ -423,12 +408,6 @@ fn find_pre_post_state_expr(fcx: fn_ctxt, pres: prestate, e: @expr) -> bool {
                                     oper_assign_op);
       }
       expr_while(test, body) {
-        /*
-        #error("in a while loop:");
-        log_expr_err(*e);
-        aux::log_tritv_err(fcx, block_poststate(fcx.ccx, body));
-        aux::log_tritv_err(fcx, pres);
-        */
         let loop_pres =
             intersect_states(block_poststate(fcx.ccx, body), pres);
 
@@ -537,13 +516,10 @@ fn find_pre_post_state_expr(fcx: fn_ctxt, pres: prestate, e: @expr) -> bool {
 fn find_pre_post_state_stmt(fcx: fn_ctxt, pres: prestate, s: @stmt) -> bool {
     let stmt_ann = stmt_to_ann(fcx.ccx, *s);
 
-    log(debug, "[" + fcx.name + "]");
-    #debug("*At beginning: stmt = ");
-    log_stmt(*s);
-    #debug("*prestate = ");
-    log(debug, tritv::to_str(stmt_ann.states.prestate));
-    #debug("*poststate =");
-    log(debug, tritv::to_str(stmt_ann.states.prestate));
+    #debug["[ %s ]", fcx.name];
+    #debug["*At beginning: stmt = %s", stmt_to_str(*s)];
+    #debug["*prestate = %s", tritv::to_str(stmt_ann.states.prestate)];
+    #debug["*poststate = %s", tritv::to_str(stmt_ann.states.prestate)];
 
     alt s.node {
       stmt_decl(adecl, id) {
@@ -559,14 +535,10 @@ fn find_pre_post_state_stmt(fcx: fn_ctxt, pres: prestate, s: @stmt) -> bool {
             let mut changed =
                 set_poststate(stmt_ann, c_and_p.post) | c_and_p.changed;
 
-            #debug("Summary: stmt = ");
-            log_stmt(*s);
-            #debug("prestate = ");
-            log(debug, tritv::to_str(stmt_ann.states.prestate));
-            #debug("poststate =");
-            log(debug, tritv::to_str(stmt_ann.states.prestate));
-            #debug("changed =");
-            log(debug, changed);
+            #debug["Summary: stmt = %s", stmt_to_str(*s)];
+            #debug["prestate = %s", tritv::to_str(stmt_ann.states.prestate)];
+            #debug["poststate = %s",tritv::to_str(stmt_ann.states.poststate)];
+            #debug["changed = %s", bool::to_str(changed)];
 
             ret changed;
           }
@@ -583,13 +555,10 @@ fn find_pre_post_state_stmt(fcx: fn_ctxt, pres: prestate, s: @stmt) -> bool {
                 set_poststate(stmt_ann, expr_poststate(fcx.ccx, ex));
 
 
-        #debug("Finally:");
-        log_stmt(*s);
-        log(debug, "prestate = ");
-        log(debug, tritv::to_str(stmt_ann.states.prestate));
-        #debug("poststate =");
-        log(debug, (tritv::to_str(stmt_ann.states.poststate)));
-        #debug("changed =");
+        #debug["Finally: %s", stmt_to_str(*s)];
+        #debug["prestate = %s", tritv::to_str(stmt_ann.states.prestate)];
+        #debug["poststate = %s", tritv::to_str(stmt_ann.states.poststate)];
+        #debug["changed = %s", bool::to_str(changed)];
 
         ret changed;
       }
@@ -624,20 +593,6 @@ fn find_pre_post_state_block(fcx: fn_ctxt, pres0: prestate, b: blk) -> bool {
     set_prestate_ann(fcx.ccx, b.node.id, pres0);
     set_poststate_ann(fcx.ccx, b.node.id, post);
 
-
-    /*
-        #error("For block:");
-        log_block_err(b);
-        #error("poststate = ");
-        log_states_err(block_states(fcx.ccx, b));
-        #error("pres0:");
-        log_tritv_err(fcx, pres0);
-        #error("post:");
-        log_tritv_err(fcx, post);
-        #error("changed = ");
-        log(error, changed);
-    */
-
     ret changed;
 }
 
diff --git a/src/rustc/middle/typeck.rs b/src/rustc/middle/typeck.rs
index 51e5886340b..f8b24d004b7 100644
--- a/src/rustc/middle/typeck.rs
+++ b/src/rustc/middle/typeck.rs
@@ -46,7 +46,7 @@ import syntax::ast_util::{local_def, respan, split_class_items};
 import syntax::visit;
 import metadata::csearch;
 import driver::session::session;
-import util::common::*;
+import util::common::may_break;
 import syntax::codemap::span;
 import pat_util::{pat_is_variant, pat_id_map};
 import middle::ty;
diff --git a/src/rustc/util/common.rs b/src/rustc/util/common.rs
index daab9eb33f1..dfddbab647f 100644
--- a/src/rustc/util/common.rs
+++ b/src/rustc/util/common.rs
@@ -33,41 +33,6 @@ fn field_exprs(fields: [ast::field]) -> [@ast::expr] {
     ret es;
 }
 
-fn log_expr(e: ast::expr) {
-    log(debug, print::pprust::expr_to_str(@e));
-}
-
-fn log_expr_err(e: ast::expr) {
-    log(error, print::pprust::expr_to_str(@e));
-}
-
-fn log_ty_err(t: @ty) {
-    log(error, print::pprust::ty_to_str(t));
-}
-
-fn log_pat_err(p: @pat) {
-    log(error, print::pprust::pat_to_str(p));
-}
-
-fn log_block(b: ast::blk) {
-    log(debug, print::pprust::block_to_str(b));
-}
-
-fn log_block_err(b: ast::blk) {
-    log(error, print::pprust::block_to_str(b));
-}
-
-fn log_item_err(i: @ast::item) {
-    log(error, print::pprust::item_to_str(i));
-}
-fn log_stmt(st: ast::stmt) {
-    log(debug, print::pprust::stmt_to_str(st));
-}
-
-fn log_stmt_err(st: ast::stmt) {
-    log(error, print::pprust::stmt_to_str(st));
-}
-
 fn has_nonlocal_exits(b: ast::blk) -> bool {
     let has_exits = @mut false;
     fn visit_expr(flag: @mut bool, e: @ast::expr) {