Add single line let test
=====================================
-Complete route
+Single line let
+=====================================
+
+i = let x = 320 in x
+
+---
+
+(file
+ (value_declaration
+ (function_declaration_left (lower_case_identifier))
+ (eq)
+ (let_in_expr
+ (let)
+ (virtual_open_section)
+ (value_declaration
+ (function_declaration_left (lower_case_identifier))
+ (eq)
+ (number_constant_expr (number_literal))
+ )
+ (virtual_end_section)
+ (in)
+ (value_expr (value_qid (lower_case_identifier)))
+ )
+ )
+ (virtual_end_decl)
+)
+
+
+=====================================
+Let with case
=====================================
routeToString : Route -> String
