fix(compiler): unexpected identifier 'description' (#7194)

Fixes a bug with how we generate properties, a regression from #7190

## Checklist

- [x] Title matches [Winglang's style guide](https://www.winglang.io/contributing/start-here/pull_requests#how-are-pull-request-titles-formatted)
- [x] Description explains motivation and solution
- [x] Tests added (always)
- [ ] Docs updated (only required for features)
- [ ] Added `pr/e2e-full` label if this feature requires end-to-end testing

*By submitting this pull request, I confirm that my contribution is made under the terms of the [Wing Cloud Contribution License](https://github.com/winglang/wing/blob/main/CONTRIBUTION_LICENSE.md)*.

packages/@winglang/wingc/src/json_schema_generator.rs

@@ -88,7 +88,7 @@ impl JsonSchemaGenerator {
 
 				code.append("type:\"object\",");
 				code.append(format!(
-					"patternProperties: {{\".*\":{}}}",
+					"patternProperties: {{\".*\":{}}},",
 					self.get_struct_schema_field(t, None)
 				));
 

tests/valid/struct_from_json.test.w

@@ -345,3 +345,7 @@ test "unsafe flight" {
 
 // Check that imported files can use .fromJson on structs defined within them
 new otherExternalStructs.UsesStructInImportedFile();
+
+let resp = cloud.ApiResponse.fromJson({ status: 200, body: "ok"});
+expect.equal(resp.status, 200);
+expect.equal(resp.body, "ok");

tools/hangar/__snapshots__/test_corpus/valid/struct_from_json.test.w_compile_tf-aws.md

@@ -202,6 +202,7 @@ class $Root extends $stdlib.std.Resource {
     const Foosible = $stdlib.std.Struct._createJsonSchema({$id:"/Foosible",type:"object",properties:{f:{type:"string"},},required:[],description:""});
     const MyStruct = $stdlib.std.Struct._createJsonSchema({$id:"/MyStruct",type:"object",properties:{color:{type:"string",enum:["red", "green", "blue"],description:"color docs\n@example Color.red"},m1:{type:"object",properties:{val:{type:"number",description:"val docs"},},required:["val",],description:"m1 docs"},m2:{type:"object",properties:{val:{type:"string"},},required:["val",],description:"m2 docs"},},required:["color","m1","m2",],description:"MyStruct docs\n@foo bar"});
     const Student = $stdlib.std.Struct._createJsonSchema({$id:"/Student",type:"object",properties:{additionalData:{type:["object","string","boolean","number","array"]},advisor:{type:"object",properties:{dob:{type:"object",properties:{day:{type:"number"},month:{type:"number"},year:{type:"number"},},required:["day","month","year",],description:""},employeeID:{type:"string"},firstName:{type:"string"},lastName:{type:"string"},},required:["dob","employeeID","firstName","lastName",],description:""},coursesTaken:{type:"array",items:{type:"object",properties:{course:{type:"object",properties:{credits:{type:"number"},name:{type:"string"},},required:["credits","name",],description:""},dateTaken:{type:"object",properties:{day:{type:"number"},month:{type:"number"},year:{type:"number"},},required:["day","month","year",],description:""},grade:{type:"string"},},required:["course","dateTaken","grade",],description:""}},dob:{type:"object",properties:{day:{type:"number"},month:{type:"number"},year:{type:"number"},},required:["day","month","year",],description:""},enrolled:{type:"boolean"},enrolledCourses:{type:"array",uniqueItems:true,items:{type:"object",properties:{credits:{type:"number"},name:{type:"string"},},required:["credits","name",],description:""}},firstName:{type:"string"},lastName:{type:"string"},schoolId:{type:"string"},},required:["dob","enrolled","firstName","lastName","schoolId",],description:""});
+    const cloud_ApiResponse = $stdlib.std.Struct._createJsonSchema({$id:"/ApiResponse",type:"object",properties:{body:{type:"string",description:"The response\'s body.\n@default - no body\n@stability experimental"},headers:{type:"object",patternProperties: {".*":{type:"string"}},description:"The response\'s headers.\n@default {}\n@stability experimental",},status:{type:"number",description:"The response\'s status code.\n@default 200\n@stability experimental"},},required:[],description:"Shape of a response from a inflight handler.\n@stability experimental"});
     const cloud_CounterProps = $stdlib.std.Struct._createJsonSchema({$id:"/CounterProps",type:"object",properties:{initial:{type:"number",description:"The initial value of the counter.\n@default 0\n@stability experimental"},},required:[],description:"Options for `Counter`.\n@stability experimental"});
     const externalStructs_MyOtherStruct = $stdlib.std.Struct._createJsonSchema({$id:"/MyOtherStruct",type:"object",properties:{data:{type:"object",properties:{val:{type:"number",description:"val docs"},},required:["val",],description:"MyStruct docs in subdir"},},required:["data",],description:""});
     $helpers.nodeof(this).root.$preflightTypesMap = $preflightTypesMap;
@@ -487,6 +488,9 @@ class $Root extends $stdlib.std.Resource {
     $macros.__Struct_fromJson(false, Student, ({"obviously": "not a student"}), { unsafe: true });
     globalThis.$ClassFactory.new("@winglang/sdk.std.Test", std.Test, this, "test:unsafe flight", new $Closure5(this, "$Closure5"));
     globalThis.$ClassFactory.new("examples-valid.subdir.UsesStructInImportedFile", otherExternalStructs.UsesStructInImportedFile, this, "UsesStructInImportedFile");
+    const resp = $macros.__Struct_fromJson(false, cloud_ApiResponse, ({"status": 200, "body": "ok"}));
+    (expect.Util.equal(resp.status, 200));
+    (expect.Util.equal(resp.body, "ok"));
   }
 }
 const $APP = $PlatformManager.createApp({ outdir: $outdir, name: "struct_from_json.test", rootConstruct: $Root, isTestEnvironment: $wing_is_test, entrypointDir: process.env['WING_SOURCE_DIR'], rootId: process.env['WING_ROOT_ID'] });