Merge branch 'variant-literal' into 'main'

Draft: Syntax for variants

See merge request jwestman/blueprint-compiler!224

blueprintcompiler/language/gobject_signal.py

@@ -143,12 +143,13 @@ class Signal(AstNode):
 
     @property
     def document_symbol(self) -> DocumentSymbol:
+        detail = self.ranges["detail_start", "detail_end"]
         return DocumentSymbol(
             self.full_name,
             SymbolKind.Event,
             self.range,
             self.group.tokens["name"].range,
-            self.ranges["detail_start", "detail_end"].text,
+            detail.text if detail is not None else None,
         )
 
     def get_reference(self, idx: int) -> T.Optional[LocationLink]:

tests/sample_errors/incomplete_signal.blp

@@ -0,0 +1,5 @@
+using Gtk 4.0;
+
+Label {
+  notify::
+}

tests/sample_errors/incomplete_signal.err

@@ -0,0 +1,2 @@
+5,1,0,Expected a signal detail name
+4,9,3,Unexpected tokens