Lex hashes

lib/ahem/ast/operators.rb

   OR = :or
   AND = :and
   NOT = :not
+  HASH = :'#'
 end

lib/ahem/lexer.rb

     elsif source.match(/\A\>/)
       @position += 1
       Token.new(TokenKinds::OPERATOR, :>)
+    elsif source.match(/\A\#/)
+      @position += 1
+      Token.new(TokenKinds::OPERATOR, :'#')
     elsif source.match(/\Aand/)
       @position += 3
       Token.new(TokenKinds::OPERATOR, :and)

spec/lexer_spec.rb

   end
 
   it 'lexes operators' do
-    expect(Lexer.new('+-*/<<=>>=== and or not').scan_all).to eq(
+    expect(Lexer.new('+-*/<<=>>===# and or not').scan_all).to eq(
       [
         Token.new(TokenKinds::OPERATOR, :+),
         Token.new(TokenKinds::OPERATOR, :-),
         Token.new(TokenKinds::OPERATOR, :>),
         Token.new(TokenKinds::OPERATOR, :>=),
         Token.new(TokenKinds::OPERATOR, :==),
+        Token.new(TokenKinds::OPERATOR, :'#'),
         Token.new(TokenKinds::OPERATOR, :and),
         Token.new(TokenKinds::OPERATOR, :or),
         Token.new(TokenKinds::OPERATOR, :not),