Warn when using options_for_select as a value

lib/phlex/rails/helpers/options_for_select.rb

@@ -1,9 +1,16 @@
 # frozen_string_literal: true
 
 module Phlex::Rails::Helpers::OptionsForSelect
+	Never = Object.new
+
 	extend Phlex::Rails::HelperMacros
 
-	# @!method options_for_select(...)
-	# 	@return [nil]
-	register_output_helper :options_for_select
+	def options_for_select(...)
+		context = @_context
+		return if context.fragments && !context.in_target_fragment
+
+		raw helpers.options_for_select(...)
+
+		Never
+	end
 end

lib/phlex/rails/helpers/select_tag.rb

@@ -3,7 +3,22 @@
 module Phlex::Rails::Helpers::SelectTag
 	extend Phlex::Rails::HelperMacros
 
-	# @!method select_tag(...)
-	# 	@return [nil]
-	register_output_helper :select_tag
+	def select_tag(*args, **kwargs, &block)
+		context = @_context
+		return if context.fragments && !context.in_target_fragment
+
+		if args[1] == Phlex::Rails::Helpers::OptionsForSelect::Never
+			raise ArgumentError.new(<<~MESSAGE
+				Figure out how to explain this problem here.
+			MESSAGE
+		end
+
+		output = if block
+			helpers.select_tag(*args, **kwargs) { capture(&block) }
+		else
+			helpers.select_tag(*args, **kwargs)
+		end
+
+		raw(output)
+	end
 end