Add initial values to inject calls

Injecting with no prepend argument can cause nil to be returned where not
expected.

1 files changed, 2 insertions, 2 deletions

diff --git a/state.rb b/state.rb
index a7920ae..b45ebb5 100644
--- a/state.rb
+++ b/state.rb
@@ -111,7 +111,7 @@ class State
 
 	# Parameters to this state
 	def params
-		@deps.map{ |x| x.params }.inject{ |x,y| x.merge y }.merge \
+		@deps.map{ |x| x.params }.inject({}){ |x,y| x.merge y }.merge \
 			@holds.map{ |x| x.params }.inject{ |x,y| x.merge y }
 	end
 
@@ -147,7 +147,7 @@ class State
 	def rooted_in(set)
 		@deps.inject(true){ |x,y| x and y.rooted_in set } and \
 		self.class.depends.map{ |x| set.select{ |y| x === y } } \
-			.inject{ |x, y| x+y }.to_set.subset? @deps
+			.inject([]){ |x, y| x+y }.to_set.subset? @deps
 	end
 
 	# Create a new type of state. +name+ is capitalized and postfixed with "State"