> - Modify the functions in regproc.c. Take a look at how other text input
> functions work to see what needs to happen here (you'll want to use
> text_to_cstring() as part of that.)
>
> - Modify the appropriate entries in src/include/catalog/pg_proc.h

Let me try.
`make check` says "All 160 tests passed.".
diff --git a/src/backend/utils/adt/regproc.c b/src/backend/utils/adt/regproc.c
index 0f17eb8..eed1279 100644
--- a/src/backend/utils/adt/regproc.c
+++ b/src/backend/utils/adt/regproc.c
@@ -161,7 +161,7 @@ regprocin(PG_FUNCTION_ARGS)
 Datum
 to_regproc(PG_FUNCTION_ARGS)
 {
-       char       *pro_name = PG_GETARG_CSTRING(0);
+       const char         *pro_name = text_to_cstring(PG_GETARG_TEXT_P(0));
        List       *names;
        FuncCandidateList clist;
 
@@ -331,7 +331,7 @@ regprocedurein(PG_FUNCTION_ARGS)
 Datum
 to_regprocedure(PG_FUNCTION_ARGS)
 {
-       char       *pro_name = PG_GETARG_CSTRING(0);
+       const char         *pro_name = text_to_cstring(PG_GETARG_TEXT_P(0));
        List       *names;
        int                     nargs;
        Oid                     argtypes[FUNC_MAX_ARGS];
@@ -620,7 +620,7 @@ regoperin(PG_FUNCTION_ARGS)
 Datum
 to_regoper(PG_FUNCTION_ARGS)
 {
-       char       *opr_name = PG_GETARG_CSTRING(0);
+       const char         *opr_name = text_to_cstring(PG_GETARG_TEXT_P(0));
        List       *names;
        FuncCandidateList clist;
 
@@ -797,7 +797,7 @@ regoperatorin(PG_FUNCTION_ARGS)
 Datum
 to_regoperator(PG_FUNCTION_ARGS)
 {
-       char       *opr_name_or_oid = PG_GETARG_CSTRING(0);
+       const char         *opr_name_or_oid = 
text_to_cstring(PG_GETARG_TEXT_P(0));
        Oid                     result;
        List       *names;
        int                     nargs;
@@ -1061,7 +1061,7 @@ regclassin(PG_FUNCTION_ARGS)
 Datum
 to_regclass(PG_FUNCTION_ARGS)
 {
-       char       *class_name = PG_GETARG_CSTRING(0);
+       const char         *class_name = text_to_cstring(PG_GETARG_TEXT_P(0));
        Oid                     result;
        List       *names;
 
@@ -1249,7 +1249,7 @@ regtypein(PG_FUNCTION_ARGS)
 Datum
 to_regtype(PG_FUNCTION_ARGS)
 {
-       char       *typ_name = PG_GETARG_CSTRING(0);
+       const char         *typ_name = text_to_cstring(PG_GETARG_TEXT_P(0));
        Oid                     result;
        int32           typmod;
 
@@ -1606,7 +1606,7 @@ regrolein(PG_FUNCTION_ARGS)
 Datum
 to_regrole(PG_FUNCTION_ARGS)
 {
-       char       *role_name = PG_GETARG_CSTRING(0);
+       const char         *role_name = text_to_cstring(PG_GETARG_TEXT_P(0));
        Oid                     result;
        List       *names;
 
@@ -1727,7 +1727,7 @@ regnamespacein(PG_FUNCTION_ARGS)
 Datum
 to_regnamespace(PG_FUNCTION_ARGS)
 {
-       char       *nsp_name = PG_GETARG_CSTRING(0);
+       const char         *nsp_name = text_to_cstring(PG_GETARG_TEXT_P(0));
        Oid                     result;
        List       *names;
 
diff --git a/src/include/catalog/pg_proc.h b/src/include/catalog/pg_proc.h
index e5d6c77..22d9386 100644
--- a/src/include/catalog/pg_proc.h
+++ b/src/include/catalog/pg_proc.h
@@ -177,9 +177,9 @@ DATA(insert OID =  44 (  regprocin             PGNSP PGUID 
12 1 0 0 0 f f f f t f s s 1
 DESCR("I/O");
 DATA(insert OID =  45 (  regprocout               PGNSP PGUID 12 1 0 0 0 f f f 
f t f s s 1 0 2275 "24" _null_ _null_ _null_ _null_ _null_ regprocout _null_ 
_null_ _null_ ));
 DESCR("I/O");
-DATA(insert OID = 3494 (  to_regproc           PGNSP PGUID 12 1 0 0 0 f f f f 
t f s s 1 0 24 "2275" _null_ _null_ _null_ _null_ _null_ to_regproc _null_ 
_null_ _null_ ));
+DATA(insert OID = 3494 (  to_regproc           PGNSP PGUID 12 1 0 0 0 f f f f 
t f s s 1 0 24 "25" _null_ _null_ _null_ _null_ _null_ to_regproc _null_ _null_ 
_null_ ));
 DESCR("convert proname to regproc");
-DATA(insert OID = 3479 (  to_regprocedure      PGNSP PGUID 12 1 0 0 0 f f f f 
t f s s 1 0 2202 "2275" _null_ _null_ _null_ _null_ _null_ to_regprocedure 
_null_ _null_ _null_ ));
+DATA(insert OID = 3479 (  to_regprocedure      PGNSP PGUID 12 1 0 0 0 f f f f 
t f s s 1 0 2202 "25" _null_ _null_ _null_ _null_ _null_ to_regprocedure _null_ 
_null_ _null_ ));
 DESCR("convert proname to regprocedure");
 DATA(insert OID =  46 (  textin                           PGNSP PGUID 12 1 0 0 
0 f f f f t f i s 1 0 25 "2275" _null_ _null_ _null_ _null_ _null_ textin 
_null_ _null_ _null_ ));
 DESCR("I/O");
@@ -3483,9 +3483,9 @@ DATA(insert OID = 2214 (  regoperin                       
PGNSP PGUID 12 1 0 0 0 f f f f t f s s 1 0
 DESCR("I/O");
 DATA(insert OID = 2215 (  regoperout           PGNSP PGUID 12 1 0 0 0 f f f f 
t f s s 1 0 2275 "2203" _null_ _null_ _null_ _null_ _null_ regoperout _null_ 
_null_ _null_ ));
 DESCR("I/O");
-DATA(insert OID = 3492 (  to_regoper           PGNSP PGUID 12 1 0 0 0 f f f f 
t f s s 1 0 2203 "2275" _null_ _null_ _null_ _null_ _null_ to_regoper _null_ 
_null_ _null_ ));
+DATA(insert OID = 3492 (  to_regoper           PGNSP PGUID 12 1 0 0 0 f f f f 
t f s s 1 0 2203 "25" _null_ _null_ _null_ _null_ _null_ to_regoper _null_ 
_null_ _null_ ));
 DESCR("convert operator name to regoper");
-DATA(insert OID = 3476 (  to_regoperator       PGNSP PGUID 12 1 0 0 0 f f f f 
t f s s 1 0 2204 "2275" _null_ _null_ _null_ _null_ _null_ to_regoperator 
_null_ _null_ _null_ ));
+DATA(insert OID = 3476 (  to_regoperator       PGNSP PGUID 12 1 0 0 0 f f f f 
t f s s 1 0 2204 "25" _null_ _null_ _null_ _null_ _null_ to_regoperator _null_ 
_null_ _null_ ));
 DESCR("convert operator name to regoperator");
 DATA(insert OID = 2216 (  regoperatorin                PGNSP PGUID 12 1 0 0 0 
f f f f t f s s 1 0 2204 "2275" _null_ _null_ _null_ _null_ _null_ 
regoperatorin _null_ _null_ _null_ ));
 DESCR("I/O");
@@ -3495,13 +3495,13 @@ DATA(insert OID = 2218 (  regclassin            PGNSP 
PGUID 12 1 0 0 0 f f f f t f s s 1 0
 DESCR("I/O");
 DATA(insert OID = 2219 (  regclassout          PGNSP PGUID 12 1 0 0 0 f f f f 
t f s s 1 0 2275 "2205" _null_ _null_ _null_ _null_ _null_ regclassout _null_ 
_null_ _null_ ));
 DESCR("I/O");
-DATA(insert OID = 3495 (  to_regclass          PGNSP PGUID 12 1 0 0 0 f f f f 
t f s s 1 0 2205 "2275" _null_ _null_ _null_ _null_ _null_ to_regclass _null_ 
_null_ _null_ ));
+DATA(insert OID = 3495 (  to_regclass          PGNSP PGUID 12 1 0 0 0 f f f f 
t f s s 1 0 2205 "25" _null_ _null_ _null_ _null_ _null_ to_regclass _null_ 
_null_ _null_ ));
 DESCR("convert classname to regclass");
 DATA(insert OID = 2220 (  regtypein                    PGNSP PGUID 12 1 0 0 0 
f f f f t f s s 1 0 2206 "2275" _null_ _null_ _null_ _null_ _null_ regtypein 
_null_ _null_ _null_ ));
 DESCR("I/O");
 DATA(insert OID = 2221 (  regtypeout           PGNSP PGUID 12 1 0 0 0 f f f f 
t f s s 1 0 2275 "2206" _null_ _null_ _null_ _null_ _null_ regtypeout _null_ 
_null_ _null_ ));
 DESCR("I/O");
-DATA(insert OID = 3493 (  to_regtype           PGNSP PGUID 12 1 0 0 0 f f f f 
t f s s 1 0 2206 "2275" _null_ _null_ _null_ _null_ _null_ to_regtype _null_ 
_null_ _null_ ));
+DATA(insert OID = 3493 (  to_regtype           PGNSP PGUID 12 1 0 0 0 f f f f 
t f s s 1 0 2206 "25" _null_ _null_ _null_ _null_ _null_ to_regtype _null_ 
_null_ _null_ ));
 DESCR("convert type name to regtype");
 DATA(insert OID = 1079 (  regclass                     PGNSP PGUID 12 1 0 0 0 
f f f f t f s s 1 0 2205 "25" _null_ _null_ _null_ _null_ _null_ text_regclass 
_null_ _null_ _null_ ));
 DESCR("convert text to regclass");
@@ -3510,14 +3510,14 @@ DATA(insert OID = 4098 (  regrolein                     
PGNSP PGUID 12 1 0 0 0 f f f f t f s s 1 0
 DESCR("I/O");
 DATA(insert OID = 4092 (  regroleout           PGNSP PGUID 12 1 0 0 0 f f f f 
t f s s 1 0 2275 "4096" _null_ _null_ _null_ _null_ _null_ regroleout _null_ 
_null_ _null_ ));
 DESCR("I/O");
-DATA(insert OID = 4093 (  to_regrole           PGNSP PGUID 12 1 0 0 0 f f f f 
t f s s 1 0 4096 "2275" _null_ _null_ _null_ _null_ _null_ to_regrole _null_ 
_null_ _null_ ));
+DATA(insert OID = 4093 (  to_regrole           PGNSP PGUID 12 1 0 0 0 f f f f 
t f s s 1 0 4096 "25" _null_ _null_ _null_ _null_ _null_ to_regrole _null_ 
_null_ _null_ ));
 DESCR("convert role name to regrole");
 
 DATA(insert OID = 4084 (  regnamespacein       PGNSP PGUID 12 1 0 0 0 f f f f 
t f s s 1 0 4089 "2275" _null_ _null_ _null_ _null_ _null_ regnamespacein 
_null_ _null_ _null_ ));
 DESCR("I/O");
 DATA(insert OID = 4085 (  regnamespaceout      PGNSP PGUID 12 1 0 0 0 f f f f 
t f s s 1 0 2275 "4089" _null_ _null_ _null_ _null_ _null_ regnamespaceout 
_null_ _null_ _null_ ));
 DESCR("I/O");
-DATA(insert OID = 4086 (  to_regnamespace      PGNSP PGUID 12 1 0 0 0 f f f f 
t f s s 1 0 4089 "2275" _null_ _null_ _null_ _null_ _null_ to_regnamespace 
_null_ _null_ _null_ ));
+DATA(insert OID = 4086 (  to_regnamespace      PGNSP PGUID 12 1 0 0 0 f f f f 
t f s s 1 0 4089 "25" _null_ _null_ _null_ _null_ _null_ to_regnamespace _null_ 
_null_ _null_ ));
 DESCR("convert namespace name to regnamespace");
 
 DATA(insert OID = 2246 ( fmgr_internal_validator PGNSP PGUID 12 1 0 0 0 f f f 
f t f s s 1 0 2278 "26" _null_ _null_ _null_ _null_ _null_ 
fmgr_internal_validator _null_ _null_ _null_ ));
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