vala: Improve error message for invalid handler of dynamic signal

1 files changed, 5 insertions, 1 deletions

diff --git a/vala/valamemberaccess.vala b/vala/valamemberaccess.vala
index 5be3fa0da..f3b87994a 100644
--- a/vala/valamemberaccess.vala
+++ b/vala/valamemberaccess.vala
@@ -489,7 +489,11 @@ public class Vala.MemberAccess : Expression {
 							unowned MemberAccess? arg = s.handler as MemberAccess;
 							if (arg == null || !arg.check (context) || !(arg.symbol_reference is Method)) {
 								error = true;
-								Report.error (s.handler.source_reference, "Invalid handler for `%s'", s.get_full_name ());
+								if (s.handler is LambdaExpression) {
+									Report.error (s.handler.source_reference, "Lambdas are not allowed for dynamic signals");
+								} else {
+									Report.error (s.handler.source_reference, "Cannot infer call signature for dynamic signal `%s' from given expression", s.get_full_name ());
+								}
 							}
 						}
 						s.access = SymbolAccessibility.PUBLIC;