Add structured coroutines and explicit error handling

cmd/gotlin-lsp/main_test.go

@@ -92,7 +92,7 @@ fun main() {
 			t.Fatalf("unexpected builtin diagnostic: %+v", diagnostic)
 		}
 	}
-	for _, name := range []string{"ByteSlice", "append", "len", "sql", "set", "now"} {
+	for _, name := range []string{"ByteSlice", "append", "keys", "goAssert", "len", "sql", "set", "now"} {
 		if !isBuiltin(name) {
 			t.Fatalf("%s is not registered as builtin", name)
 		}
@@ -694,7 +694,7 @@ fun runWorker(name: String) {
 }
 
 fun main() {
-    go runWorker("alice")
+    runBlocking { launch { runWorker("alice") } }
 }
 `)
 
@@ -717,9 +717,11 @@ fun writer(ch: Channel<Int>) {
 
 fun main() {
     val ch = Channel<Int>()
-    go writer(ch)
-    select {
-        ch -> println(it)
+    runBlocking {
+        launch { writer(ch) }
+        select {
+            ch -> println(it)
+        }
     }
     val v = ch.read()
     println(v)
@@ -778,22 +780,11 @@ fun main() {
 `)
 
 	state := buildDocumentState(text)
-	if state.program == nil {
-		t.Fatal("expected parsed program")
+	if state.program != nil {
+		t.Fatal("worker syntax should no longer parse")
 	}
-	if len(state.diagnostics) != 0 {
-		t.Fatalf("expected no diagnostics, got %+v", state.diagnostics)
-	}
-
-	var counterDetail string
-	for _, sym := range state.symbols {
-		if sym.Kind == symbolKindVariable && sym.Name == "counter" {
-			counterDetail = sym.Detail
-			break
-		}
-	}
-	if counterDetail != "val counter: Counter" {
-		t.Fatalf("unexpected counter detail: %q", counterDetail)
+	if len(state.diagnostics) == 0 {
+		t.Fatal("expected removed worker syntax diagnostic")
 	}
 }