diff --git a/src/Makefile b/src/Makefile
index afea1af3382..7236e02f874 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -489,6 +489,7 @@ TEST_XFAILS_LLVM := $(TASK_XFAILS) \
                       obj-recursion.rs \
                       obj-return-polytypes.rs \
                       obj-with-vec.rs \
+                      operator-associativity.rs \
                       output-slot-variants.rs \
                       pred.rs \
                       preempt.rs \
@@ -576,10 +577,18 @@ RFAIL_RS := $(wildcard test/run-fail/*.rs)
 CFAIL_RC := $(wildcard test/compile-fail/*.rc)
 CFAIL_RS := $(wildcard test/compile-fail/*.rs)
 
+ifdef CHECK_XFAILS
+TEST_RPASS_CRATES_X86 := $(filter $(TEST_XFAILS_X86), $(RPASS_RC))
+TEST_RPASS_CRATES_LLVM := $(filter $(TEST_XFAILS_LLVM), $(RPASS_RC))
+TEST_RPASS_SOURCES_X86 := $(filter $(TEST_XFAILS_X86), $(RPASS_RS))
+TEST_RPASS_SOURCES_LLVM := $(filter $(TEST_XFAILS_LLVM), $(RPASS_RS))
+else
 TEST_RPASS_CRATES_X86 := $(filter-out $(TEST_XFAILS_X86), $(RPASS_RC))
 TEST_RPASS_CRATES_LLVM := $(filter-out $(TEST_XFAILS_LLVM), $(RPASS_RC))
 TEST_RPASS_SOURCES_X86 := $(filter-out $(TEST_XFAILS_X86), $(RPASS_RS))
 TEST_RPASS_SOURCES_LLVM := $(filter-out $(TEST_XFAILS_LLVM), $(RPASS_RS))
+endif
+
 TEST_RPASS_EXTRAS := $(wildcard test/run-pass/*/*.rs)
 TEST_RPASS_EXES_X86 := \
                       $(TEST_RPASS_CRATES_X86:.rc=.x86$(CFG_EXE_SUFFIX)) \
diff --git a/src/boot/fe/pexp.ml b/src/boot/fe/pexp.ml
index 9b870639f52..fb2d91a05ba 100644
--- a/src/boot/fe/pexp.ml
+++ b/src/boot/fe/pexp.ml
@@ -718,131 +718,175 @@ and parse_negation_pexp (ps:pstate) : pexp =
 
 (* Binops are all left-associative,                *)
 (* so we factor out some of the parsing code here. *)
-and binop_rhs
+and binop_build
     (ps:pstate)
     (name:string)
     (apos:pos)
-    (lhs:pexp)
     (rhs_parse_fn:pstate -> pexp)
+    (lhs:pexp)
+    (step_fn:pexp -> pexp)
     (op:Ast.binop)
     : pexp =
   bump ps;
   let rhs = (ctxt (name ^ " rhs") rhs_parse_fn ps) in
   let bpos = lexpos ps in
-    span ps apos bpos (PEXP_binop (op, lhs, rhs))
+  let node = span ps apos bpos (PEXP_binop (op, lhs, rhs)) in
+    step_fn node
 
 
 and parse_factor_pexp (ps:pstate) : pexp =
   let name = "factor pexp" in
   let apos = lexpos ps in
   let lhs = ctxt (name ^ " lhs") parse_negation_pexp ps in
+  let build = binop_build ps name apos parse_negation_pexp in
+  let rec step accum =
     match peek ps with
-        STAR    -> binop_rhs ps name apos lhs parse_factor_pexp Ast.BINOP_mul
-      | SLASH   -> binop_rhs ps name apos lhs parse_factor_pexp Ast.BINOP_div
-      | PERCENT -> binop_rhs ps name apos lhs parse_factor_pexp Ast.BINOP_mod
-      | _       -> lhs
+        STAR    -> build accum step Ast.BINOP_mul
+      | SLASH   -> build accum step Ast.BINOP_div
+      | PERCENT -> build accum step Ast.BINOP_mod
+      | _       -> accum
+  in
+    step lhs
 
 
 and parse_term_pexp (ps:pstate) : pexp =
   let name = "term pexp" in
   let apos = lexpos ps in
   let lhs = ctxt (name ^ " lhs") parse_factor_pexp ps in
+  let build = binop_build ps name apos parse_factor_pexp in
+  let rec step accum =
     match peek ps with
-        PLUS  -> binop_rhs ps name apos lhs parse_term_pexp Ast.BINOP_add
-      | MINUS -> binop_rhs ps name apos lhs parse_term_pexp Ast.BINOP_sub
-      | _     -> lhs
+        PLUS  -> build accum step Ast.BINOP_add
+      | MINUS -> build accum step Ast.BINOP_sub
+      | _     -> accum
+  in
+    step lhs
 
 
 and parse_shift_pexp (ps:pstate) : pexp =
   let name = "shift pexp" in
   let apos = lexpos ps in
   let lhs = ctxt (name ^ " lhs") parse_term_pexp ps in
+  let build = binop_build ps name apos parse_term_pexp in
+  let rec step accum =
     match peek ps with
-        LSL -> binop_rhs ps name apos lhs parse_shift_pexp Ast.BINOP_lsl
-      | LSR -> binop_rhs ps name apos lhs parse_shift_pexp Ast.BINOP_lsr
-      | ASR -> binop_rhs ps name apos lhs parse_shift_pexp Ast.BINOP_asr
-      | _ -> lhs
+        LSL -> build accum step Ast.BINOP_lsl
+      | LSR -> build accum step Ast.BINOP_lsr
+      | ASR -> build accum step Ast.BINOP_asr
+      | _   -> accum
+  in
+    step lhs
 
 
 and parse_and_pexp (ps:pstate) : pexp =
   let name = "and pexp" in
   let apos = lexpos ps in
   let lhs = ctxt (name ^ " lhs") parse_shift_pexp ps in
+  let build = binop_build ps name apos parse_shift_pexp in
+  let rec step accum =
     match peek ps with
-        AND -> binop_rhs ps name apos lhs parse_and_pexp Ast.BINOP_and
-      | _   -> lhs
+        AND -> build accum step Ast.BINOP_and
+      | _   -> accum
+  in
+    step lhs
 
 
 and parse_xor_pexp (ps:pstate) : pexp =
   let name = "xor pexp" in
   let apos = lexpos ps in
   let lhs = ctxt (name ^ " lhs") parse_and_pexp ps in
+  let build = binop_build ps name apos parse_and_pexp in
+  let rec step accum =
     match peek ps with
-        CARET -> binop_rhs ps name apos lhs parse_xor_pexp Ast.BINOP_xor
-      | _ -> lhs
+        CARET -> build accum step Ast.BINOP_xor
+      | _     -> accum
+  in
+    step lhs
 
 
 and parse_or_pexp (ps:pstate) : pexp =
   let name = "or pexp" in
   let apos = lexpos ps in
   let lhs = ctxt (name ^ " lhs") parse_xor_pexp ps in
+  let build = binop_build ps name apos parse_xor_pexp in
+  let rec step accum =
     match peek ps with
-        OR -> binop_rhs ps name apos lhs parse_or_pexp Ast.BINOP_or
-      | _  -> lhs
+        OR -> build accum step Ast.BINOP_or
+      | _  -> accum
+  in
+    step lhs
 
 
 and parse_relational_pexp (ps:pstate) : pexp =
   let name = "relational pexp" in
   let apos = lexpos ps in
   let lhs = ctxt (name ^ " lhs") parse_or_pexp ps in
+  let build = binop_build ps name apos parse_or_pexp in
+  let rec step accum =
     match peek ps with
-        LT -> binop_rhs ps name apos lhs parse_relational_pexp Ast.BINOP_lt
-      | LE -> binop_rhs ps name apos lhs parse_relational_pexp Ast.BINOP_le
-      | GE -> binop_rhs ps name apos lhs parse_relational_pexp Ast.BINOP_ge
-      | GT -> binop_rhs ps name apos lhs parse_relational_pexp Ast.BINOP_gt
-      | _  -> lhs
+        LT -> build accum step Ast.BINOP_lt
+      | LE -> build accum step Ast.BINOP_le
+      | GE -> build accum step Ast.BINOP_ge
+      | GT -> build accum step Ast.BINOP_gt
+      | _  -> accum
+  in
+    step lhs
 
 
 and parse_equality_pexp (ps:pstate) : pexp =
   let name = "equality pexp" in
   let apos = lexpos ps in
   let lhs = ctxt (name ^ " lhs") parse_relational_pexp ps in
+  let build = binop_build ps name apos parse_relational_pexp in
+  let rec step accum =
     match peek ps with
-        EQEQ -> binop_rhs ps name apos lhs parse_equality_pexp Ast.BINOP_eq
-      | NE   -> binop_rhs ps name apos lhs parse_equality_pexp Ast.BINOP_ne
-      | _    -> lhs
+        EQEQ -> build accum step Ast.BINOP_eq
+      | NE   -> build accum step Ast.BINOP_ne
+      | _    -> accum
+  in
+    step lhs
 
 
 and parse_andand_pexp (ps:pstate) : pexp =
   let name = "andand pexp" in
   let apos = lexpos ps in
   let lhs = ctxt (name ^ " lhs") parse_equality_pexp ps in
+  let rec step accum =
     match peek ps with
         ANDAND ->
           bump ps;
-          let rhs = parse_andand_pexp ps in
+          let rhs = parse_equality_pexp ps in
           let bpos = lexpos ps in
-            span ps apos bpos (PEXP_lazy_and (lhs, rhs))
+          let node = span ps apos bpos (PEXP_lazy_and (accum, rhs)) in
+            step node
 
-      | _   -> lhs
+      | _   -> accum
+  in
+    step lhs
 
 
 and parse_oror_pexp (ps:pstate) : pexp =
   let name = "oror pexp" in
   let apos = lexpos ps in
   let lhs = ctxt (name ^ " lhs") parse_andand_pexp ps in
+  let rec step accum =
     match peek ps with
         OROR ->
           bump ps;
-          let rhs = parse_oror_pexp ps in
+          let rhs = parse_andand_pexp ps in
           let bpos = lexpos ps in
-            span ps apos bpos (PEXP_lazy_or (lhs, rhs))
+          let node = span ps apos bpos (PEXP_lazy_or (accum, rhs)) in
+            step node
+
+      | _  -> accum
+  in
+    step lhs
 
-      | _  -> lhs
 
 and parse_as_pexp (ps:pstate) : pexp =
   let apos = lexpos ps in
   let pexp = ctxt "as pexp" parse_oror_pexp ps in
+  let rec step accum =
     match peek ps with
         AS ->
           bump ps;
@@ -850,10 +894,16 @@ and parse_as_pexp (ps:pstate) : pexp =
           let t = parse_ty ps in
           let bpos = lexpos ps in
           let t = span ps tapos bpos t in
+          let node =
             span ps apos bpos
-              (PEXP_unop ((Ast.UNOP_cast t), pexp))
+              (PEXP_unop ((Ast.UNOP_cast t), accum))
+          in
+            step node
+
+      | _ -> accum
+  in
+    step pexp
 
-      | _       -> pexp
 
 and parse_pexp (ps:pstate) : pexp =
   parse_as_pexp ps
diff --git a/src/boot/me/type.ml b/src/boot/me/type.ml
index 57fdc4574f4..787855f0c1a 100644
--- a/src/boot/me/type.ml
+++ b/src/boot/me/type.ml
@@ -472,6 +472,7 @@ let check_stmt (cx:Semant.ctxt) : (fn_ctx -> Ast.stmt -> unit) =
   and internal_check_outer_lval
       ~mut:(mut:Ast.mutability)
       ~deref:(deref:bool)
+      ~fn_args:(fn_args:(Ast.ty array) option)
       (infer:Ast.ty option)
       (lval:Ast.lval)
       : (Ast.ty * int) =
@@ -485,11 +486,15 @@ let check_stmt (cx:Semant.ctxt) : (fn_ctx -> Ast.stmt -> unit) =
           demand expected actual;
           yield_ty actual
       | None, (LTYPE_poly _ as lty) ->
-          Common.err
-            None
-            "not enough context to automatically instantiate the polymorphic \
-              type '%a'; supply type parameters explicitly"
-            sprintf_ltype lty
+          begin
+            match fn_args with
+                None ->
+                  Common.err None
+                    "can't auto-instantiate %a" sprintf_ltype lty
+              | Some args ->
+                  Common.err None "can't auto-instantiate %a on %d args"
+                    sprintf_ltype lty (Array.length args)
+          end
       | Some _, (LTYPE_poly _) ->
           (* FIXME: auto-instantiate *)
           Common.unimpl
@@ -502,6 +507,7 @@ let check_stmt (cx:Semant.ctxt) : (fn_ctx -> Ast.stmt -> unit) =
   and generic_check_lval
       ~mut:(mut:Ast.mutability)
       ~deref:(deref:bool)
+      ~fn_args:(fn_args:(Ast.ty array) option)
       (infer:Ast.ty option)
       (lval:Ast.lval)
       : Ast.ty =
@@ -521,7 +527,7 @@ let check_stmt (cx:Semant.ctxt) : (fn_ctx -> Ast.stmt -> unit) =
                 | Some t -> Fmt.fmt_to_str Ast.fmt_ty t))
     in
     let (lval_ty, n_boxes) =
-      internal_check_outer_lval ~mut:mut ~deref:deref infer lval
+      internal_check_outer_lval ~mut ~deref ~fn_args infer lval
     in
     let _ =
       iflog cx
@@ -563,9 +569,10 @@ let check_stmt (cx:Semant.ctxt) : (fn_ctx -> Ast.stmt -> unit) =
   and check_lval
       ?mut:(mut=Ast.MUT_immutable)
       ?deref:(deref=false)
+      ?fn_args:(fn_args=None)
       (lval:Ast.lval)
       : Ast.ty =
-    generic_check_lval ~mut:mut ~deref:deref None lval
+    generic_check_lval ~fn_args ~mut ~deref None lval
 
   and check_atom ?deref:(deref=false) (atom:Ast.atom) : Ast.ty =
     match atom with
@@ -582,7 +589,7 @@ let check_stmt (cx:Semant.ctxt) : (fn_ctx -> Ast.stmt -> unit) =
       (ty:Ast.ty)
       (lval:Ast.lval)
       : unit =
-    ignore (generic_check_lval ?mut:mut ~deref:false
+    ignore (generic_check_lval ~mut ~deref:false ~fn_args:None
               (Some (Ast.TY_mutable ty)) lval)
   in
 
@@ -636,7 +643,7 @@ let check_stmt (cx:Semant.ctxt) : (fn_ctx -> Ast.stmt -> unit) =
    * returns the return type. *)
   let check_fn (callee:Ast.lval) (args:Ast.atom array) : Ast.ty =
     let arg_tys = Array.map check_atom args in
-    let callee_ty = check_lval callee in
+    let callee_ty = check_lval callee ~fn_args:(Some arg_tys) in
     demand_fn (Array.map (fun ty -> Some ty) arg_tys) callee_ty
   in
 
diff --git a/src/lib/_io.rs b/src/lib/_io.rs
index 94021aa650a..142f808a645 100644
--- a/src/lib/_io.rs
+++ b/src/lib/_io.rs
@@ -2,23 +2,19 @@ type buf_reader = unsafe obj {
   fn read() -> vec[u8];
 };
 
+type buf_writer = unsafe obj {
+  fn write(vec[u8] v);
+};
+
 fn default_bufsz() -> uint {
   ret 4096u;
 }
 
 fn new_buf() -> vec[u8] {
-  let vec[u8] v = vec();
-  let uint i = default_bufsz();
-  while (i > 0u) {
-    i -= 1u;
-    v += vec(0u8);
-  }
-  // FIXME (issue #93): should be:
-  // ret _vec.alloc[u8](default_bufsz());
-  ret v;
+  ret _vec.alloc[u8](default_bufsz());
 }
 
-fn new_buf_reader(str s) -> buf_reader {
+fn new_buf_reader(str path) -> buf_reader {
 
   unsafe obj fd_buf_reader(int fd, mutable vec[u8] buf) {
 
@@ -47,11 +43,67 @@ fn new_buf_reader(str s) -> buf_reader {
     }
   }
 
-  auto fd = os.libc.open(_str.buf(s), 0);
+  auto fd = os.libc.open(_str.buf(path),
+                         os.libc_constants.O_RDONLY() |
+                         os.libc_constants.O_BINARY(),
+                         0u);
+
   if (fd < 0) {
-    log "error opening file";
+    log "error opening file for reading";
     log sys.rustrt.last_os_error();
     fail;
   }
   ret fd_buf_reader(fd, new_buf());
 }
+
+type fileflag = tag(append(), create(), truncate());
+
+fn new_buf_writer(str path, vec[fileflag] flags) -> buf_writer {
+
+  unsafe obj fd_buf_writer(int fd) {
+
+    fn write(vec[u8] v) {
+      auto len = _vec.len[u8](v);
+      auto count = 0u;
+      auto vbuf;
+      while (count < len) {
+        vbuf = _vec.buf_off[u8](v, count);
+        auto nout = os.libc.write(fd, vbuf, len);
+        if (nout < 0) {
+          log "error dumping buffer";
+          log sys.rustrt.last_os_error();
+          fail;
+        }
+        count += nout as uint;
+      }
+    }
+
+    drop {
+      os.libc.close(fd);
+    }
+  }
+
+  let int fflags =
+    os.libc_constants.O_WRONLY() |
+    os.libc_constants.O_BINARY();
+
+  for (fileflag f in flags) {
+    alt (f) {
+      case (append())   { fflags |= os.libc_constants.O_APPEND(); }
+      case (create())   { fflags |= os.libc_constants.O_CREAT(); }
+      case (truncate()) { fflags |= os.libc_constants.O_TRUNC(); }
+    }
+  }
+
+  auto fd = os.libc.open(_str.buf(path),
+                         fflags,
+                         os.libc_constants.S_IRUSR() |
+                         os.libc_constants.S_IWUSR());
+
+  if (fd < 0) {
+    log "error opening file for writing";
+    log sys.rustrt.last_os_error();
+    fail;
+  }
+  ret fd_buf_writer(fd);
+}
diff --git a/src/lib/_vec.rs b/src/lib/_vec.rs
index 43779015000..e374bf52da1 100644
--- a/src/lib/_vec.rs
+++ b/src/lib/_vec.rs
@@ -3,7 +3,7 @@ import op = util.operator;
 
 native "rust" mod rustrt {
   type vbuf;
-  fn vec_buf[T](vec[T] v) -> vbuf;
+  fn vec_buf[T](vec[T] v, uint offset) -> vbuf;
   fn vec_len[T](vec[T] v) -> uint;
   /* The T in vec_alloc[T, U] is the type of the vec to allocate.  The
    * U is the type of an element in the vec.  So to allocate a vec[U] we
@@ -50,7 +50,12 @@ fn len[T](vec[T] v) -> uint {
 }
 
 fn buf[T](vec[T] v) -> vbuf {
-  ret rustrt.vec_buf[T](v);
+  ret rustrt.vec_buf[T](v, 0u);
+}
+
+fn buf_off[T](vec[T] v, uint offset) -> vbuf {
+  check (offset < len[T](v));
+  ret rustrt.vec_buf[T](v, offset);
 }
 
 // Returns elements from [start..end) from v.
diff --git a/src/lib/linux_os.rs b/src/lib/linux_os.rs
index a775a97ab7c..3f096e99def 100644
--- a/src/lib/linux_os.rs
+++ b/src/lib/linux_os.rs
@@ -3,7 +3,7 @@ import _vec.vbuf;
 
 native mod libc = "libc.so.6" {
 
-  fn open(sbuf s, int flags) -> int;
+  fn open(sbuf s, int flags, uint mode) -> int;
   fn read(int fd, vbuf buf, uint count) -> int;
   fn write(int fd, vbuf buf, uint count) -> int;
   fn close(int fd) -> int;
@@ -17,3 +17,18 @@ native mod libc = "libc.so.6" {
   fn setenv(sbuf n, sbuf v, int overwrite) -> int;
   fn unsetenv(sbuf n) -> int;
 }
+
+mod libc_constants {
+  fn O_RDONLY() -> int { ret 0x0000; }
+  fn O_WRONLY() -> int { ret 0x0001; }
+  fn O_RDWR()   -> int { ret 0x0002; }
+  fn O_APPEND() -> int { ret 0x0400; }
+  fn O_CREAT()  -> int { ret 0x0040; }
+  fn O_EXCL()   -> int { ret 0x0080; }
+  fn O_TRUNC()  -> int { ret 0x0200; }
+  fn O_TEXT()   -> int { ret 0x0000; } // nonexistent in linux libc
+  fn O_BINARY() -> int { ret 0x0000; } // nonexistent in linux libc
+
+  fn S_IRUSR() -> uint { ret 0x0100u; }
+  fn S_IWUSR() -> uint { ret 0x0080u; }
+}
diff --git a/src/lib/macos_os.rs b/src/lib/macos_os.rs
index 8b30c8bc6b0..2ada5c0781c 100644
--- a/src/lib/macos_os.rs
+++ b/src/lib/macos_os.rs
@@ -3,7 +3,7 @@ import _vec.vbuf;
 
 native mod libc = "libc.dylib" {
 
-  fn open(sbuf s, int flags) -> int;
+  fn open(sbuf s, int flags, uint mode) -> int;
   fn read(int fd, vbuf buf, uint count) -> int;
   fn write(int fd, vbuf buf, uint count) -> int;
   fn close(int fd) -> int;
@@ -17,3 +17,18 @@ native mod libc = "libc.dylib" {
   fn setenv(sbuf n, sbuf v, int overwrite) -> int;
   fn unsetenv(sbuf n) -> int;
 }
+
+mod libc_constants {
+  fn O_RDONLY() -> int { ret 0x0000; }
+  fn O_WRONLY() -> int { ret 0x0001; }
+  fn O_RDWR()   -> int { ret 0x0002; }
+  fn O_APPEND() -> int { ret 0x0008; }
+  fn O_CREAT()  -> int { ret 0x0200; }
+  fn O_EXCL()   -> int { ret 0x0800; }
+  fn O_TRUNC()  -> int { ret 0x0400; }
+  fn O_TEXT()   -> int { ret 0x0000; } // nonexistent in darwin libc
+  fn O_BINARY() -> int { ret 0x0000; } // nonexistent in darwin libc
+
+  fn S_IRUSR() -> uint { ret 0x0400u; }
+  fn S_IWUSR() -> uint { ret 0x0200u; }
+}
diff --git a/src/lib/win32_os.rs b/src/lib/win32_os.rs
index f770a5de4ed..3d8e5f3a4d9 100644
--- a/src/lib/win32_os.rs
+++ b/src/lib/win32_os.rs
@@ -2,8 +2,23 @@ import _str.sbuf;
 import _vec.vbuf;
 
 native mod libc = "msvcrt.dll" {
-  fn open(sbuf s, int flags) -> int = "_open";
+  fn open(sbuf s, int flags, uint mode) -> int = "_open";
   fn read(int fd, vbuf buf, uint count) -> int = "_read";
   fn write(int fd, vbuf buf, uint count) -> int = "_write";
   fn close(int fd) -> int = "_close";
 }
+
+mod libc_constants {
+  fn O_RDONLY() -> int { ret 0x0000; }
+  fn O_WRONLY() -> int { ret 0x0001; }
+  fn O_RDWR()   -> int { ret 0x0002; }
+  fn O_APPEND() -> int { ret 0x0400; }
+  fn O_CREAT()  -> int { ret 0x0040; }
+  fn O_EXCL()   -> int { ret 0x0080; }
+  fn O_TRUNC()  -> int { ret 0x0200; }
+  fn O_TEXT()   -> int { ret 0x4000; }
+  fn O_BINARY() -> int { ret 0x8000; }
+
+  fn S_IRUSR() -> uint { ret 0x0100u; } // really _S_IREAD  in win32
+  fn S_IWUSR() -> uint { ret 0x0080u; } // really _S_IWRITE in win32
+}
diff --git a/src/rt/rust_builtin.cpp b/src/rt/rust_builtin.cpp
index 0879681c87d..657109c6df2 100644
--- a/src/rt/rust_builtin.cpp
+++ b/src/rt/rust_builtin.cpp
@@ -116,9 +116,9 @@ str_buf(rust_task *task, rust_str *s)
 }
 
 extern "C" CDECL void *
-vec_buf(rust_task *task, type_desc *ty, rust_vec *v)
+vec_buf(rust_task *task, type_desc *ty, rust_vec *v, size_t offset)
 {
-    return (void *)&v->data[0];
+    return (void *)&v->data[ty->size * offset];
 }
 
 extern "C" CDECL size_t
diff --git a/src/test/run-pass/operator-associativity.rs b/src/test/run-pass/operator-associativity.rs
new file mode 100644
index 00000000000..2c028eba627
--- /dev/null
+++ b/src/test/run-pass/operator-associativity.rs
@@ -0,0 +1,4 @@
+// Testcase for issue #130, operator associativity.
+fn main() -> () {
+  check ((3 * 5 / 2) == 7);
+}