Imported Upstream version 5.10.0.47

Former-commit-id: d0813289fa2d35e1f8ed77530acb4fb1df441bc0

mcs/errors/cs8340-2.cs

@@ -0,0 +1,13 @@
+// CS8340: `S.field': Instance fields in readonly structs must be readonly
+// Line: 6
+// Compiler options: -langversion:latest
+
+readonly partial struct S
+{
+
+}
+
+partial struct S
+{
+	int field;
+}