Fix case_statement/lambda-close-over-variables bug, rename ast_node file to make ast_node:: unambigious, change test_ast to test_compiler and add a little skeleton c_generator file

tests/test_compiler.krak

@@ -7,6 +7,7 @@ import util:*
 import symbol:*
 import tree:*
 import serialize:*
+import c_generator:*
 
 fun main():int {
 
@@ -72,10 +73,15 @@ fun main():int {
     /*println(ast_to_dot(ast))*/
     /*write_file(string("ast.dot"), ast_to_dot(ast))*/
 
+    var kraken_file_name = string("to_parse.krak")
     var parse.construct(gram): parser
     var ast_pass.construct(): ast_transformation
     var importer.construct(parse, ast_pass): importer
-    importer.import(string("to_parse.krak"))
+    importer.import(kraken_file_name)
+    var c_generator.construct(): c_generator
+    var c_output_pair = c_generator.generate(importer.name_ast_map)
+    write_file(kraken_file_name + ".c", c_output_pair.first)
+    println(string("linker string: ") + c_output_pair.second)
 
     return 0
 }