From 65eb876cb4284a3d96c5910e21a2153ce55c5535 Mon Sep 17 00:00:00 2001
From: Moritz Lenz <moritz@faui2k3.org>
Date: Mon, 2 Aug 2010 15:07:17 +0200
Subject: [PATCH] attempt to produce more awesme error message when you do map
 { hash => 1}

---
 src/core/Any-list.pm | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/core/Any-list.pm b/src/core/Any-list.pm
index c360605680f..acd98cfcfd4 100644
--- a/src/core/Any-list.pm
+++ b/src/core/Any-list.pm
@@ -34,6 +34,13 @@ augment class Any {
 
     our multi method map(&block) { self.list.map(&block); }
 
+    our multi method map(%block) {
+        die "Can't call map() with a Hash argument, Callable required\n"
+            ~ "You probably wrote a Hash composer accidentally - try to\n"
+            ~ "disambiguate the it with a ; directly after the opening brace";
+
+    }
+
     our multi method sort(&by = &infix:<cmp>) { self.list.sort(&by); }
 
     method rotate($n = 1) { self.list.rotate($n); }
@@ -355,7 +362,7 @@ proto sub max($by, *@values) { @values.max($by); }
 proto sub minmax($by, *@values) { @values.minmax($by); }
 proto sub uniq(@values) { @values.uniq; }
 proto sub pick ($num, :$replace, *@values) { @values.pick($num, :$replace); }
-proto sub map(&mapper, *@values) { @values.map(&mapper); }
+proto sub map($mapper, *@values) { @values.map($mapper); }
 proto sub kv(@array) { @array.kv; }
 proto sub keys(@array) { @array.keys; }
 proto sub values(@array) { @array.values; }