+/* --- XS helpers ---------------------------------------------------------- */
+
+#define XSH_PACKAGE "Variable::Magic"
+
+#include "xsh/caps.h"
+#include "xsh/util.h"
+
+/* ... Features ............................................................ */
+
+/* uvar magic and Hash::Util::FieldHash were commited with 28419, but we only
+ * enable them on 5.10 */
+#if XSH_HAS_PERL(5, 10, 0)
+# define VMG_UVAR 1
+#else
+# define VMG_UVAR 0
+#endif
+
+#if XSH_HAS_PERL_MAINT(5, 11, 0, 32969) || XSH_HAS_PERL(5, 12, 0)
+# define VMG_COMPAT_SCALAR_LENGTH_NOLEN 1
+#else
+# define VMG_COMPAT_SCALAR_LENGTH_NOLEN 0
+#endif
+
+#if XSH_HAS_PERL(5, 17, 4)
+# define VMG_COMPAT_SCALAR_NOLEN 1
+#else
+# define VMG_COMPAT_SCALAR_NOLEN 0
+#endif
+
+/* Applied to dev-5.9 as 25854, integrated to maint-5.8 as 28160, partially
+ * reverted to dev-5.11 as 9cdcb38b */
+#if XSH_HAS_PERL_MAINT(5, 8, 9, 28160) || XSH_HAS_PERL_MAINT(5, 9, 3, 25854) || XSH_HAS_PERL(5, 10, 0)
+# ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN
+# if XSH_HAS_PERL(5, 11, 0)
+# define VMG_COMPAT_ARRAY_PUSH_NOLEN 0
+# else
+# define VMG_COMPAT_ARRAY_PUSH_NOLEN 1
+# endif
+# endif
+# ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID
+# define VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID 1
+# endif
+#else
+# ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN
+# define VMG_COMPAT_ARRAY_PUSH_NOLEN 0
+# endif
+# ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID
+# define VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID 0
+# endif
+#endif
+
+/* Applied to dev-5.11 as 34908 */
+#if XSH_HAS_PERL_MAINT(5, 11, 0, 34908) || XSH_HAS_PERL(5, 12, 0)
+# define VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID 1
+#else
+# define VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID 0
+#endif
+
+/* Applied to dev-5.9 as 31473 (see #43357), integrated to maint-5.8 as 32542 */
+#if XSH_HAS_PERL_MAINT(5, 8, 9, 32542) || XSH_HAS_PERL_MAINT(5, 9, 5, 31473) || XSH_HAS_PERL(5, 10, 0)
+# define VMG_COMPAT_ARRAY_UNDEF_CLEAR 1
+#else
+# define VMG_COMPAT_ARRAY_UNDEF_CLEAR 0
+#endif
+
+#if XSH_HAS_PERL(5, 11, 0)
+# define VMG_COMPAT_HASH_DELETE_NOUVAR_VOID 1
+#else
+# define VMG_COMPAT_HASH_DELETE_NOUVAR_VOID 0
+#endif
+
+#if XSH_HAS_PERL(5, 17, 0)
+# define VMG_COMPAT_CODE_COPY_CLONE 1
+#else
+# define VMG_COMPAT_CODE_COPY_CLONE 0
+#endif
+
+#if XSH_HAS_PERL(5, 13, 2)
+# define VMG_COMPAT_GLOB_GET 1
+#else
+# define VMG_COMPAT_GLOB_GET 0
+#endif
+
+/* ... Trampoline ops ...................................................... */
+
+#define VMG_PROPAGATE_ERRSV_NEEDS_TRAMPOLINE (XSH_HAS_PERL(5, 10, 0) && !XSH_HAS_PERL(5, 10, 1))