Add test for lambda

tests/lambdas/lambda.cc

@@ -0,0 +1,74 @@
+void foo() {
+  int x;
+
+  auto dosomething = [&x](int y) {
+    ++x;
+    ++y;
+  };
+
+  dosomething(1);
+  dosomething(1);
+  dosomething(1);
+}
+
+/*
+OUTPUT:
+{
+  "types": [{
+      "id": 0,
+      "usr": "c:lambda.cc@47@F@foo#@Sa",
+      "short_name": "",
+      "detailed_name": "",
+      "instances": [1]
+    }],
+  "funcs": [{
+      "id": 0,
+      "is_operator": false,
+      "usr": "c:@F@foo#",
+      "short_name": "foo",
+      "detailed_name": "void foo()",
+      "definition_spelling": "1:6-1:9",
+      "definition_extent": "1:1-12:2",
+      "callees": ["1@9:14-9:15", "1@10:14-10:15", "1@11:14-11:15"]
+    }, {
+      "id": 1,
+      "is_operator": false,
+      "usr": "c:lambda.cc@57@F@foo#@Sa@F@operator()#I#1",
+      "short_name": "",
+      "detailed_name": "",
+      "callers": ["0@9:14-9:15", "0@10:14-10:15", "0@11:14-11:15"]
+    }],
+  "vars": [{
+      "id": 0,
+      "usr": "c:lambda.cc@16@F@foo#@x",
+      "short_name": "x",
+      "detailed_name": "int x",
+      "definition_spelling": "2:7-2:8",
+      "definition_extent": "2:3-2:8",
+      "is_local": true,
+      "is_macro": false,
+      "uses": ["2:7-2:8", "5:7-5:8", "4:24-4:25"]
+    }, {
+      "id": 1,
+      "usr": "c:lambda.cc@28@F@foo#@dosomething",
+      "short_name": "dosomething",
+      "detailed_name": "(lambda at C:/Users/jacob/Desktop/cquery/tests/lambdas/lambda.cc:4:22) dosomething",
+      "definition_spelling": "4:8-4:19",
+      "definition_extent": "4:3-7:4",
+      "variable_type": 0,
+      "is_local": true,
+      "is_macro": false,
+      "uses": ["4:8-4:19", "9:3-9:14", "10:3-10:14", "11:3-11:14"]
+    }, {
+      "id": 2,
+      "usr": "c:lambda.cc@52@F@foo#@Sa@F@operator()#I#1@y",
+      "short_name": "y",
+      "detailed_name": "int y",
+      "definition_spelling": "4:31-4:32",
+      "definition_extent": "4:31-4:32",
+      "is_local": false,
+      "is_macro": false,
+      "uses": ["4:31-4:32", "6:7-6:8"]
+    }]
+}
+*/