(Maint) Fix mis-use of rvalue functions as statements

.rspec

@@ -0,0 +1,4 @@
+--color
+--format
+progress
+--backtrace

spec/unit/puppet/parser/functions/getvar_spec.rb

@@ -23,12 +23,12 @@ def get_scope
   describe 'when calling getvar from puppet' do
 
     it "should not compile when no arguments are passed" do
-      Puppet[:code] = 'getvar()'
+      Puppet[:code] = '$rval = getvar()'
       get_scope
       expect { @scope.compiler.compile }.should raise_error(Puppet::ParseError, /wrong number of arguments/)
     end
     it "should not compile when too many arguments are passed" do
-      Puppet[:code] = 'getvar("foo::bar", "baz")'
+      Puppet[:code] = '$rval = getvar("foo::bar", "baz")'
       get_scope
       expect { @scope.compiler.compile }.should raise_error(Puppet::ParseError, /wrong number of arguments/)
     end

spec/unit/puppet/parser/functions/has_key_spec.rb

@@ -22,15 +22,15 @@
 
   describe 'when calling has_key from puppet' do
     it "should not compile when no arguments are passed" do
-      Puppet[:code] = 'has_key()'
+      Puppet[:code] = '$rval = has_key()'
       expect { compiler.compile }.should raise_error(Puppet::ParseError, /wrong number of arguments/)
     end
     it "should not compile when 1 argument is passed" do
-      Puppet[:code] = "has_key('foo')"
+      Puppet[:code] = "$rval = has_key('foo')"
       expect { compiler.compile }.should raise_error(Puppet::ParseError, /wrong number of arguments/)
     end
     it "should require the first value to be a Hash" do
-      Puppet[:code] = "has_key('foo', 'bar')"
+      Puppet[:code] = "$rval = has_key('foo', 'bar')"
       expect { compiler.compile }.should raise_error(Puppet::ParseError, /expects the first argument to be a hash/)
     end
   end

spec/unit/puppet/parser/functions/merge_spec.rb

@@ -22,11 +22,11 @@
 
   describe 'when calling merge from puppet' do
     it "should not compile when no arguments are passed" do
-      Puppet[:code] = 'merge()'
+      Puppet[:code] = '$rval = merge()'
       expect { compiler.compile }.should raise_error(Puppet::ParseError, /wrong number of arguments/)
     end
     it "should not compile when 1 argument is passed" do
-      Puppet[:code] = "$my_hash={'one' => 1}\nmerge($my_hash)"
+      Puppet[:code] = "$my_hash={'one' => 1}\n$rval = merge($my_hash)"
       expect { compiler.compile }.should raise_error(Puppet::ParseError, /wrong number of arguments/)
     end
   end