diff --git a/src/comp/front/test.rs b/src/comp/front/test.rs
index fa48c9fbfb88a..0def097992854 100644
--- a/src/comp/front/test.rs
+++ b/src/comp/front/test.rs
@@ -302,7 +302,7 @@ fn mk_test_wrapper(cx: test_ctxt,
                    span: span) -> @ast::expr {
     let call_expr: ast::expr = {
         id: cx.next_node_id(),
-        node: ast::expr_call(@fn_path_expr, []),
+        node: ast::expr_call(@fn_path_expr, [], false),
         span: span
     };
 
@@ -401,7 +401,7 @@ fn mk_test_main_call(cx: test_ctxt) -> @ast::expr {
     let test_path_expr: ast::expr =
         {id: cx.next_node_id(), node: test_path_expr_, span: dummy_sp()};
 
-    let test_call_expr_: ast::expr_ = ast::expr_call(@test_path_expr, []);
+    let test_call_expr_ = ast::expr_call(@test_path_expr, [], false);
 
     let test_call_expr: ast::expr =
         {id: cx.next_node_id(), node: test_call_expr_, span: dummy_sp()};
@@ -419,7 +419,7 @@ fn mk_test_main_call(cx: test_ctxt) -> @ast::expr {
 
     let test_main_call_expr_: ast::expr_ =
         ast::expr_call(@test_main_path_expr,
-                       [@args_path_expr, @test_call_expr]);
+                       [@args_path_expr, @test_call_expr], false);
 
     let test_main_call_expr: ast::expr =
         {id: cx.next_node_id(), node: test_main_call_expr_, span: dummy_sp()};
diff --git a/src/comp/middle/alias.rs b/src/comp/middle/alias.rs
index 36f6d0f0017e8..5b96bddfe3f3f 100644
--- a/src/comp/middle/alias.rs
+++ b/src/comp/middle/alias.rs
@@ -93,7 +93,7 @@ fn visit_fn(cx: @ctx, f: ast::_fn, _tp: [ast::ty_param], sp: span,
 fn visit_expr(cx: @ctx, ex: @ast::expr, sc: scope, v: vt<scope>) {
     let handled = true;
     alt ex.node {
-      ast::expr_call(f, args) {
+      ast::expr_call(f, args, _) {
         check_call(*cx, f, args);
         handled = false;
       }
@@ -667,7 +667,7 @@ fn expr_root(cx: ctx, ex: @ast::expr, autoderef: bool)
     }
     if is_none(path_def_id(cx, base_root.ex)) {
         alt base_root.ex.node {
-          ast::expr_call(f, args) {
+          ast::expr_call(f, args, _) {
             let fty = ty::expr_ty(cx.tcx, f);
             alt ty::ty_fn_ret_style(cx.tcx, fty) {
               ast::return_ref(mut, arg_n) {
diff --git a/src/comp/middle/fn_usage.rs b/src/comp/middle/fn_usage.rs
index 3f6b2908c201e..e7c3033ce1f20 100644
--- a/src/comp/middle/fn_usage.rs
+++ b/src/comp/middle/fn_usage.rs
@@ -42,7 +42,7 @@ fn fn_usage_expr(expr: @ast::expr,
         }
       }
 
-      ast::expr_call(f, args) {
+      ast::expr_call(f, args, _) {
         let f_ctx = {unsafe_fn_legal: true,
                      generic_bare_fn_legal: true with ctx};
         v.visit_expr(f, f_ctx, v);
diff --git a/src/comp/middle/kind.rs b/src/comp/middle/kind.rs
index da908f55429be..81032c6a91f43 100644
--- a/src/comp/middle/kind.rs
+++ b/src/comp/middle/kind.rs
@@ -174,7 +174,7 @@ fn need_shared_or_pinned_ctor(tcx: ty::ctxt, a: @ast::expr, descr: str) {
     fn pinned_ctor(a: @ast::expr) -> bool {
         // FIXME: Technically a lambda block is also a pinned ctor
         alt a.node {
-          ast::expr_call(cexpr, _) {
+          ast::expr_call(cexpr, _, _) {
             // Assuming that if it's a call that it's safe to move in, mostly
             // because I don't know offhand how to ensure that it's a call
             // specifically to a resource constructor
@@ -224,7 +224,7 @@ fn check_expr(tcx: ty::ctxt, e: @ast::expr) {
       ast::expr_fail(option::some(a)) {
         need_expr_kind(tcx, a, ast::kind_shared, "'fail' operand");
       }
-      ast::expr_call(callee, _) {
+      ast::expr_call(callee, _, _) {
         let tpt = ty::expr_ty_params_and_ty(tcx, callee);
 
         // If we have typarams, we're calling an item; we need to check
diff --git a/src/comp/middle/mut.rs b/src/comp/middle/mut.rs
index 9dfddd2ae9779..4c286e6cab437 100644
--- a/src/comp/middle/mut.rs
+++ b/src/comp/middle/mut.rs
@@ -150,7 +150,7 @@ fn visit_decl(cx: @ctx, d: @decl, &&e: (), v: visit::vt<()>) {
 
 fn visit_expr(cx: @ctx, ex: @expr, &&e: (), v: visit::vt<()>) {
     alt ex.node {
-      expr_call(f, args) { check_call(cx, f, args); }
+      expr_call(f, args, _) { check_call(cx, f, args); }
       expr_swap(lhs, rhs) {
         check_lval(cx, lhs, msg_assign);
         check_lval(cx, rhs, msg_assign);
diff --git a/src/comp/middle/trans.rs b/src/comp/middle/trans.rs
index 6f9456dea2aaa..d47ee48734166 100644
--- a/src/comp/middle/trans.rs
+++ b/src/comp/middle/trans.rs
@@ -3147,7 +3147,7 @@ fn expr_is_lval(tcx: ty::ctxt, e: @ast::expr) -> bool {
           ty::ty_rec(_) { true }
         }
       }
-      ast::expr_call(f, _) {
+      ast::expr_call(f, _, _) {
           let fty = ty::expr_ty(tcx, f);
           ast_util::ret_by_ref(ty::ty_fn_ret_style(tcx, fty))
       }
@@ -3198,7 +3198,7 @@ fn trans_lval(cx: @block_ctxt, e: @ast::expr) -> lval_result {
         ret lval_owned(sub.bcx, val);
       }
       // This is a by-ref returning call. Regular calls are not lval
-      ast::expr_call(f, args) {
+      ast::expr_call(f, args, _) {
         let cell = empty_dest_cell();
         let bcx = trans_call(cx, f, args, e.id, by_val(cell));
         ret lval_owned(bcx, *cell);
@@ -4175,7 +4175,7 @@ fn trans_expr(bcx: @block_ctxt, e: @ast::expr, dest: dest) -> @block_ctxt {
       ast::expr_anon_obj(anon_obj) {
         ret trans_anon_obj(bcx, e.span, anon_obj, e.id, dest);
       }
-      ast::expr_call(f, args) {
+      ast::expr_call(f, args, _) {
         ret trans_call(bcx, f, args, e.id, dest);
       }
       ast::expr_field(_, _) {
diff --git a/src/comp/middle/tstate/auxiliary.rs b/src/comp/middle/tstate/auxiliary.rs
index 6ffd10c02bdf0..b8544e2b5add3 100644
--- a/src/comp/middle/tstate/auxiliary.rs
+++ b/src/comp/middle/tstate/auxiliary.rs
@@ -607,7 +607,7 @@ fn exprs_to_constr_args(tcx: ty::ctxt, args: [@expr]) -> [@constr_arg_use] {
 
 fn expr_to_constr(tcx: ty::ctxt, e: @expr) -> sp_constr {
     alt e.node {
-      expr_call(operator, args) {
+      expr_call(operator, args, _) {
         alt operator.node {
           expr_path(p) {
             ret respan(e.span,
diff --git a/src/comp/middle/tstate/collect_locals.rs b/src/comp/middle/tstate/collect_locals.rs
index 28d9c288aa7b4..b3c8d71a3bf7c 100644
--- a/src/comp/middle/tstate/collect_locals.rs
+++ b/src/comp/middle/tstate/collect_locals.rs
@@ -32,7 +32,7 @@ fn collect_pred(e: @expr, cx: ctxt, v: visit::vt<ctxt>) {
 
       // If it's a call, generate appropriate instances of the
       // call's constraints.
-      expr_call(operator, operands) {
+      expr_call(operator, operands, _) {
         for c: @ty::constr in constraints_expr(cx.tcx, operator) {
             let ct: sp_constr =
                 respan(c.span,
diff --git a/src/comp/middle/tstate/pre_post_conditions.rs b/src/comp/middle/tstate/pre_post_conditions.rs
index dee66e6df4dc7..d0832142d3e74 100644
--- a/src/comp/middle/tstate/pre_post_conditions.rs
+++ b/src/comp/middle/tstate/pre_post_conditions.rs
@@ -309,7 +309,7 @@ fn find_pre_post_expr(fcx: fn_ctxt, e: @expr) {
 
 
     alt e.node {
-      expr_call(operator, operands) {
+      expr_call(operator, operands, _) {
         /* copy */
 
         let args = operands;
diff --git a/src/comp/middle/tstate/states.rs b/src/comp/middle/tstate/states.rs
index 39f87f0f11458..2af37f22867ad 100644
--- a/src/comp/middle/tstate/states.rs
+++ b/src/comp/middle/tstate/states.rs
@@ -335,7 +335,7 @@ fn find_pre_post_state_expr(fcx: fn_ctxt, pres: prestate, e: @expr) -> bool {
                                                     vec::len(elts)), elts,
                                       return_val);
       }
-      expr_call(operator, operands) {
+      expr_call(operator, operands, _) {
         ret find_pre_post_state_call(fcx, pres, operator, e.id,
                                      callee_arg_init_ops(fcx, operator.id),
                                      operands,
diff --git a/src/comp/middle/typeck.rs b/src/comp/middle/typeck.rs
index 7e4c80d5a2791..a20ab23f9f61a 100644
--- a/src/comp/middle/typeck.rs
+++ b/src/comp/middle/typeck.rs
@@ -2072,7 +2072,7 @@ fn check_expr_with_unifier(fcx: @fn_ctxt, expr: @ast::expr, unify: unifier,
                            out_args, rt, cf, constrs);
         write::ty_only_fixup(fcx, id, ft);
       }
-      ast::expr_call(f, args) {
+      ast::expr_call(f, args, _) {
         bot = check_call_full(fcx, expr.span, f, args, expr.id);
       }
       ast::expr_self_method(ident) {
@@ -2535,7 +2535,7 @@ fn check_pred_expr(fcx: @fn_ctxt, e: @ast::expr) -> bool {
     /* e must be a call expr where all arguments are either
     literals or slots */
     alt e.node {
-      ast::expr_call(operator, operands) {
+      ast::expr_call(operator, operands, _) {
         if !ty::is_pred_ty(fcx.ccx.tcx, expr_ty(fcx.ccx.tcx, operator)) {
             fcx.ccx.tcx.sess.span_err
                 (operator.span,
@@ -2632,7 +2632,7 @@ fn check_constraints(fcx: @fn_ctxt, cs: [@ast::constr], args: [ast::arg]) {
         let call_expr_id = fcx.ccx.tcx.sess.next_node_id();
         let call_expr =
             @{id: call_expr_id,
-              node: ast::expr_call(oper, c_args),
+              node: ast::expr_call(oper, c_args, false),
               span: c.span};
         check_pred_expr(fcx, call_expr);
     }
diff --git a/src/comp/syntax/ast.rs b/src/comp/syntax/ast.rs
index a971653c5f11c..9abab55333105 100644
--- a/src/comp/syntax/ast.rs
+++ b/src/comp/syntax/ast.rs
@@ -184,7 +184,7 @@ type expr = {id: node_id, node: expr_, span: span};
 tag expr_ {
     expr_vec([@expr], mutability);
     expr_rec([field], option::t<@expr>);
-    expr_call(@expr, [@expr]);
+    expr_call(@expr, [@expr], bool);
     expr_tup([@expr]);
     expr_self_method(ident);
     expr_bind(@expr, [option::t<@expr>]);
diff --git a/src/comp/syntax/ast_util.rs b/src/comp/syntax/ast_util.rs
index 3d4fe27d98071..b10ce87a6979c 100644
--- a/src/comp/syntax/ast_util.rs
+++ b/src/comp/syntax/ast_util.rs
@@ -163,7 +163,7 @@ fn is_exported(i: ident, m: _mod) -> bool {
 }
 
 pure fn is_call_expr(e: @expr) -> bool {
-    alt e.node { expr_call(_, _) { true } _ { false } }
+    alt e.node { expr_call(_, _, _) { true } _ { false } }
 }
 
 fn is_constraint_arg(e: @expr) -> bool {
diff --git a/src/comp/syntax/ext/fmt.rs b/src/comp/syntax/ext/fmt.rs
index b51db707daf52..f3fb25acaf900 100644
--- a/src/comp/syntax/ext/fmt.rs
+++ b/src/comp/syntax/ext/fmt.rs
@@ -79,7 +79,7 @@ fn pieces_to_expr(cx: ext_ctxt, sp: span, pieces: [piece], args: [@ast::expr])
     fn make_call(cx: ext_ctxt, sp: span, fn_path: [ast::ident],
                  args: [@ast::expr]) -> @ast::expr {
         let pathexpr = make_path_expr(cx, sp, fn_path);
-        let callexpr = ast::expr_call(pathexpr, args);
+        let callexpr = ast::expr_call(pathexpr, args, false);
         ret @{id: cx.next_id(), node: callexpr, span: sp};
     }
     fn make_rec_expr(cx: ext_ctxt, sp: span,
diff --git a/src/comp/syntax/fold.rs b/src/comp/syntax/fold.rs
index 276967b792b63..e79ca1adf9811 100644
--- a/src/comp/syntax/fold.rs
+++ b/src/comp/syntax/fold.rs
@@ -348,8 +348,9 @@ fn noop_fold_expr(e: expr_, fld: ast_fold) -> expr_ {
                      option::map(fld.fold_expr, maybe_expr))
           }
           expr_tup(elts) { expr_tup(vec::map(fld.fold_expr, elts)) }
-          expr_call(f, args) {
-            expr_call(fld.fold_expr(f), fld.map_exprs(fld.fold_expr, args))
+          expr_call(f, args, blk) {
+            expr_call(fld.fold_expr(f), fld.map_exprs(fld.fold_expr, args),
+                      blk)
           }
           expr_self_method(id) { expr_self_method(fld.fold_ident(id)) }
           expr_bind(f, args) {
diff --git a/src/comp/syntax/parse/parser.rs b/src/comp/syntax/parse/parser.rs
index 1a29a033f5621..8f632165772be 100644
--- a/src/comp/syntax/parse/parser.rs
+++ b/src/comp/syntax/parse/parser.rs
@@ -977,7 +977,7 @@ fn parse_bottom_expr(p: parser) -> @ast::expr {
             parse_seq(token::LPAREN, token::RPAREN, some(token::COMMA),
                       parse_expr, p);
         hi = es.span.hi;
-        ex = ast::expr_call(f, es.node);
+        ex = ast::expr_call(f, es.node, false);
     } else if p.peek() == token::MOD_SEP ||
                   is_ident(p.peek()) && !is_word(p, "true") &&
                       !is_word(p, "false") {
@@ -1051,7 +1051,7 @@ fn parse_dot_or_call_expr_with(p: parser, e: @ast::expr) -> @ast::expr {
                 let es = parse_seq(token::LPAREN, token::RPAREN,
                                    some(token::COMMA), parse_expr, p);
                 hi = es.span.hi;
-                let nd = ast::expr_call(e, es.node);
+                let nd = ast::expr_call(e, es.node, false);
                 e = mk_expr(p, lo, hi, nd);
             }
           }
@@ -1073,19 +1073,6 @@ fn parse_dot_or_call_expr_with(p: parser, e: @ast::expr) -> @ast::expr {
               t { unexpected(p, t); }
             }
           }
-          token::LBRACE. when is_bar(p.look_ahead(1u)) {
-            p.bump();
-            let blk = parse_fn_block_expr(p);
-            alt e.node {
-              ast::expr_call(f, args) {
-                e = @{node: ast::expr_call(f, args + [blk]) with *e};
-              }
-              _ {
-                e = mk_expr(p, lo, p.get_last_hi_pos(),
-                            ast::expr_call(e, [blk]));
-              }
-            }
-          }
           _ { ret e; }
         }
     }
@@ -1569,7 +1556,6 @@ fn parse_source_stmt(p: parser) -> @ast::stmt {
         let decl = parse_let(p);
         ret @spanned(lo, decl.span.hi, ast::stmt_decl(decl, p.get_id()));
     } else {
-
         let item_attrs;
         alt parse_outer_attrs_or_ext(p) {
           none. { item_attrs = []; }
@@ -1589,7 +1575,6 @@ fn parse_source_stmt(p: parser) -> @ast::stmt {
             }
         }
 
-
         alt maybe_item {
           some(i) {
             let hi = i.span.hi;
@@ -1599,6 +1584,21 @@ fn parse_source_stmt(p: parser) -> @ast::stmt {
           none. {
             // Remainder are line-expr stmts.
             let e = parse_expr(p);
+            // See if it is a block call
+            if p.peek() == token::LBRACE && is_bar(p.look_ahead(1u)) {
+                p.bump();
+                let blk = parse_fn_block_expr(p);
+                alt e.node {
+                  ast::expr_call(f, args, false) {
+                    e = @{node: ast::expr_call(f, args + [blk], true)
+                        with *e};
+                  }
+                  _ {
+                    e = mk_expr(p, lo, p.get_last_hi_pos(),
+                                ast::expr_call(e, [blk], true));
+                  }
+                }
+            }
             ret @spanned(lo, e.span.hi, ast::stmt_expr(e, p.get_id()));
           }
           _ { p.fatal("expected statement"); }
@@ -1624,6 +1624,7 @@ fn expr_has_value(e: @ast::expr) -> bool {
       ast::expr_for(_, _, blk) | ast::expr_do_while(blk, _) {
         !option::is_none(blk.node.expr)
       }
+      ast::expr_call(_, _, true) { false }
       _ { true }
     }
 }
diff --git a/src/comp/syntax/print/pprust.rs b/src/comp/syntax/print/pprust.rs
index 9a7944f47c83e..91e3f2ffb5992 100644
--- a/src/comp/syntax/print/pprust.rs
+++ b/src/comp/syntax/print/pprust.rs
@@ -727,11 +727,19 @@ fn print_expr(s: ps, &&expr: @ast::expr) {
         commasep_exprs(s, inconsistent, exprs);
         pclose(s);
       }
-      ast::expr_call(func, args) {
+      ast::expr_call(func, args, has_block) {
         print_expr_parens_if_not_bot(s, func);
-        popen(s);
-        commasep_exprs(s, inconsistent, args);
-        pclose(s);
+        let base_args = args, blk = none;
+        if has_block { blk = some(vec::pop(base_args)); }
+        if !has_block || vec::len(base_args) > 0u {
+            popen(s);
+            commasep_exprs(s, inconsistent, base_args);
+            pclose(s);
+        }
+        if has_block {
+            nbsp(s);
+            print_expr(s, option::get(blk));
+        }
       }
       ast::expr_self_method(ident) {
         word(s.s, "self.");
diff --git a/src/comp/syntax/visit.rs b/src/comp/syntax/visit.rs
index 3cd44fe10da32..0725611eb04dc 100644
--- a/src/comp/syntax/visit.rs
+++ b/src/comp/syntax/visit.rs
@@ -245,7 +245,7 @@ fn visit_expr<E>(ex: @expr, e: E, v: vt<E>) {
         visit_expr_opt(base, e, v);
       }
       expr_tup(elts) { for el in elts { v.visit_expr(el, e, v); } }
-      expr_call(callee, args) {
+      expr_call(callee, args, _) {
         visit_exprs(args, e, v);
         v.visit_expr(callee, e, v);
       }