Compiler segfault when getting a nonexistant member from an unnamed struct #2533.

releasenotes.md

@@ -21,6 +21,7 @@
 - Add ??? and +++= to list-precedence.
 - Fix issues with linking when using symbol aliases. #2519
 - Splatting optional compile-time macro parameter from inside lambda expression does not work #2532.
+- Compiler segfault when getting a nonexistant member from an unnamed struct #2533.
 
 ### Stdlib changes
 - Sorting functions correctly took slices by value, but also other types by value. Now, only slices are accepted by value, other containers are always by ref.

src/compiler/types.c

@@ -289,7 +289,7 @@ const char *type_to_error_string(Type *type)
 			if (!suffix && !type_is_inner_type(type)) return type->name;
 			scratch_buffer_clear();
 			type_add_parent_to_scratch(decl);
-			scratch_buffer_append(decl->name);
+			scratch_buffer_append(decl->name ? decl->name : "(anon)");
 			if (suffix) scratch_buffer_append(suffix);
 			return scratch_buffer_copy();
 		}

test/test_suite/struct/missing_anon_access.c3

@@ -0,0 +1,11 @@
+struct Test
+{
+	struct { int x; }
+}
+
+fn void main()
+{
+	Test t;
+	Test.membersof[0].get(t).x;
+	Test.membersof[0].get(t).y; // #error: here is no field or method 'Test.(anon).y'
+}