verify unusual PER canonical order
diff --git a/tests/tests-asn1c-compiler/157-per-canonical-order-OK.asn1.-Pgen-PER b/tests/tests-asn1c-compiler/157-per-canonical-order-OK.asn1.-Pgen-PER
new file mode 100644
index 0000000..e17c392
--- /dev/null
+++ b/tests/tests-asn1c-compiler/157-per-canonical-order-OK.asn1.-Pgen-PER
@@ -0,0 +1,116 @@
+
+/*** <<< INCLUDES [T] >>> ***/
+
+#include <NULL.h>
+#include <constr_CHOICE.h>
+
+/*** <<< DEPS [T] >>> ***/
+
+typedef enum T_PR {
+ T_PR_NOTHING, /* No components present */
+ T_PR_one,
+ T_PR_two,
+ T_PR_three,
+ T_PR_four
+} T_PR;
+
+/*** <<< TYPE-DECLS [T] >>> ***/
+
+typedef struct T {
+ T_PR present;
+ union T_u {
+ NULL_t one;
+ NULL_t two;
+ NULL_t three;
+ NULL_t four;
+ } choice;
+
+ /* Context for parsing across buffer boundaries */
+ asn_struct_ctx_t _asn_ctx;
+} T_t;
+
+/*** <<< FUNC-DECLS [T] >>> ***/
+
+extern asn_TYPE_descriptor_t asn_DEF_T;
+
+/*** <<< CTDEFS [T] >>> ***/
+
+static asn_per_constraints_t asn_PER_type_T_constr_1 CC_NOTUSED = {
+ { APC_CONSTRAINED, 2, 2, 0, 3 } /* (0..3) */,
+ { APC_UNCONSTRAINED, -1, -1, 0, 0 },
+ 0, 0 /* No PER value map */
+};
+
+/*** <<< STAT-DEFS [T] >>> ***/
+
+static asn_TYPE_member_t asn_MBR_T_1[] = {
+ { ATF_NOFLAGS, 0, offsetof(struct T, choice.one),
+ .tag = (ASN_TAG_CLASS_CONTEXT | (4 << 2)),
+ .tag_mode = +1, /* EXPLICIT tag at current level */
+ .type = &asn_DEF_NULL,
+ .type_selector = 0,
+ { .oer_constraints = 0, .per_constraints = 0, .general_constraints = 0 },
+ 0, 0, /* No default value */
+ .name = "one"
+ },
+ { ATF_NOFLAGS, 0, offsetof(struct T, choice.two),
+ .tag = (ASN_TAG_CLASS_CONTEXT | (3 << 2)),
+ .tag_mode = +1, /* EXPLICIT tag at current level */
+ .type = &asn_DEF_NULL,
+ .type_selector = 0,
+ { .oer_constraints = 0, .per_constraints = 0, .general_constraints = 0 },
+ 0, 0, /* No default value */
+ .name = "two"
+ },
+ { ATF_NOFLAGS, 0, offsetof(struct T, choice.three),
+ .tag = (ASN_TAG_CLASS_CONTEXT | (1 << 2)),
+ .tag_mode = +1, /* EXPLICIT tag at current level */
+ .type = &asn_DEF_NULL,
+ .type_selector = 0,
+ { .oer_constraints = 0, .per_constraints = 0, .general_constraints = 0 },
+ 0, 0, /* No default value */
+ .name = "three"
+ },
+ { ATF_NOFLAGS, 0, offsetof(struct T, choice.four),
+ .tag = (ASN_TAG_CLASS_CONTEXT | (2 << 2)),
+ .tag_mode = +1, /* EXPLICIT tag at current level */
+ .type = &asn_DEF_NULL,
+ .type_selector = 0,
+ { .oer_constraints = 0, .per_constraints = 0, .general_constraints = 0 },
+ 0, 0, /* No default value */
+ .name = "four"
+ },
+};
+static const unsigned asn_MAP_T_to_canonical_1[] = { 2, 3, 1, 0 };
+static const unsigned asn_MAP_T_from_canonical_1[] = { 3, 2, 0, 1 };
+static const asn_TYPE_tag2member_t asn_MAP_T_tag2el_1[] = {
+ { (ASN_TAG_CLASS_CONTEXT | (1 << 2)), 2, 0, 0 }, /* three */
+ { (ASN_TAG_CLASS_CONTEXT | (2 << 2)), 3, 0, 0 }, /* four */
+ { (ASN_TAG_CLASS_CONTEXT | (3 << 2)), 1, 0, 0 }, /* two */
+ { (ASN_TAG_CLASS_CONTEXT | (4 << 2)), 0, 0, 0 } /* one */
+};
+static asn_CHOICE_specifics_t asn_SPC_T_specs_1 = {
+ sizeof(struct T),
+ offsetof(struct T, _asn_ctx),
+ offsetof(struct T, present),
+ sizeof(((struct T *)0)->present),
+ .tag2el = asn_MAP_T_tag2el_1,
+ .tag2el_count = 4, /* Count of tags in the map */
+ .to_canonical_order = asn_MAP_T_to_canonical_1,
+ .from_canonical_order = asn_MAP_T_from_canonical_1,
+ .ext_start = -1 /* Extensions start */
+};
+asn_TYPE_descriptor_t asn_DEF_T = {
+ "T",
+ "T",
+ &asn_OP_CHOICE,
+ 0, /* No effective tags (pointer) */
+ 0, /* No effective tags (count) */
+ 0, /* No tags (pointer) */
+ 0, /* No tags (count) */
+ { 0, &asn_PER_type_T_constr_1, CHOICE_constraint },
+ asn_MBR_T_1,
+ 4, /* Elements count */
+ &asn_SPC_T_specs_1 /* Additional specs */
+};
+