1 files changed, 7 insertions, 5 deletions
diff --git a/src/parcom.cr b/src/parcom.cr
index dbdd44d..3aed672 100644
--- a/src/parcom.cr
+++ b/src/parcom.cr
@@ -67,9 +67,12 @@ module Parcom
       Plus.new(self, other)
     end
 
-    # TODO: allow/change to support block invocation
     def assert(f : V -> Bool)
-      Assert.new(self, f)
+      Assert.new(self, &f)
+    end
+
+    def assert(&block : V -> Bool)
+      Assert.new(self, &block)
     end
 
     # TODO: allow/change to support block invocation
@@ -118,9 +121,9 @@ module Parcom
     end
   end
 
-  # TODO: allow/change to support block invocation
   class Assert(T, V) < Parser(T, V)
-    def initialize(@p : Parser(T, V), @f : V -> Bool)
+    def initialize(@p : Parser(T, V), &block : V -> Bool)
+      @f = block
     end
 
     def parse(tokens : TokenStream(T)) : Result(T, V)
@@ -212,7 +215,6 @@ module Parcom
     end
   end
 
-  # TODO: find a way to make this use Recover on the back end
   class Optional(T, V) < Parser(T, V?)
     def initialize(@p : Parser(T, V))
     end