File 5587-string-unicode_util-Stricten-tests-for-int... of Package erlang

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File 5587-string-unicode_util-Stricten-tests-for-integers.patch of Package erlang (Revision 3e53aa07e56d6cc0c5ffbbfd2f14b043)

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From f6a337dfdbc27e17b0beb246be915817870bbf8a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Wed, 22 Jun 2022 06:38:52 +0200
Subject: [PATCH 7/7] string, unicode_util: Stricten tests for integers

---
 lib/stdlib/src/string.erl                  | 81 +++++++++++++---------
 lib/stdlib/uc_spec/gen_unicode_mod.escript | 62 +++++++++--------
 2 files changed, 84 insertions(+), 59 deletions(-)

diff --git a/lib/stdlib/src/string.erl b/lib/stdlib/src/string.erl
index a418754caf..3c62dd9333 100644
--- a/lib/stdlib/src/string.erl
+++ b/lib/stdlib/src/string.erl
@@ -76,7 +76,9 @@
 -import(lists,[member/2]).
 -compile({no_auto_import,[length/1]}).
 -compile({inline, [btoken/2, rev/1, append/2, stack/2, search_compile/1]}).
--define(ASCII_LIST(CP1,CP2), CP1 < 256, CP2 < 256, CP1 =/= $\r).
+-define(ASCII_LIST(CP1,CP2),
+        is_integer(CP1), 0 =< CP1, CP1 < 256,
+        is_integer(CP2), 0 =< CP2, CP2 < 256, CP1 =/= $\r).
 
 -export_type([grapheme_cluster/0]).
 
@@ -198,7 +200,7 @@ slice(CD, N, Length)
         [] when is_binary(CD) -> <<>>;
         L -> slice_trail(L, Length)
     end;
-slice(CD, N, infinity) ->
+slice(CD, N, infinity) when is_integer(N), N >= 0 ->
     case slice_l0(CD, N) of
         [] when is_binary(CD) -> <<>>;
         Res -> Res
@@ -261,11 +263,13 @@ trim(Str, Dir) ->
       Dir :: direction() | 'both',
       Characters :: [grapheme_cluster()].
 trim(Str, _, []) -> Str;
-trim(Str, leading, [Sep]) when is_list(Str), Sep < 256 ->
+trim(Str, leading, [Sep])
+  when is_list(Str), is_integer(Sep), 0 =< Sep, Sep < 256 ->
     trim_ls(Str, Sep);
 trim(Str, leading, Sep) when is_list(Sep) ->
     trim_l(Str, Sep);
-trim(Str, trailing, [Sep]) when is_list(Str), Sep < 256 ->
+trim(Str, trailing, [Sep])
+  when is_list(Str), is_integer(Sep), 0 =< Sep, Sep < 256 ->
     trim_ts(Str, Sep);
 trim(Str, trailing, Seps0) when is_list(Seps0) ->
     Seps = search_pattern(Seps0),
@@ -630,9 +634,10 @@ slice_l0(<<CP1/utf8, Bin/binary>>, N) when N > 0 ->
 slice_l0(L, N) ->
     slice_l(L, N).
 
-slice_l([CP1|[CP2|_]=Cont], N) when ?ASCII_LIST(CP1,CP2),N > 0 ->
+slice_l([CP1|[CP2|_]=Cont], N)
+  when ?ASCII_LIST(CP1,CP2), is_integer(N), N > 0 ->
     slice_l(Cont, N-1);
-slice_l(CD, N) when N > 0 ->
+slice_l(CD, N) when is_integer(N), N > 0 ->
     case unicode_util:gc(CD) of
         [_|Cont] -> slice_l(Cont, N-1);
         [] -> [];
@@ -641,7 +646,8 @@ slice_l(CD, N) when N > 0 ->
 slice_l(Cont, 0) ->
     Cont.
 
-slice_lb(<<CP2/utf8, Bin/binary>>, CP1, N) when ?ASCII_LIST(CP1,CP2), N > 1 ->
+slice_lb(<<CP2/utf8, Bin/binary>>, CP1, N)
+  when ?ASCII_LIST(CP1,CP2), is_integer(N), N > 1 ->
     slice_lb(Bin, CP2, N-1);
 slice_lb(Bin, CP1, N) ->
     [_|Rest] = unicode_util:gc([CP1|Bin]),
@@ -693,9 +699,13 @@ slice_bin(CD, CP1, N) when N > 0 ->
 slice_bin(CD, CP1, 0) ->
     byte_size(CD)+byte_size(<<CP1/utf8>>).
 
-uppercase_list([CP1|[CP2|_]=Cont], _Changed) when $a =< CP1, CP1 =< $z, CP2 < 256 ->
+uppercase_list([CP1|[CP2|_]=Cont], _Changed)
+  when is_integer(CP1), $a =< CP1, CP1 =< $z,
+       is_integer(CP2), 0 =< CP2, CP2 < 256 ->
     [CP1-32|uppercase_list(Cont, true)];
-uppercase_list([CP1|[CP2|_]=Cont], Changed) when CP1 < 128, CP2 < 256 ->
+uppercase_list([CP1|[CP2|_]=Cont], Changed)
+  when is_integer(CP1), 0 =< CP1, CP1 < 128,
+       is_integer(CP2), 0 =< CP2, CP2 < 256 ->
     [CP1|uppercase_list(Cont, Changed)];
 uppercase_list([], true) ->
     [];
@@ -709,16 +719,16 @@ uppercase_list(CPs0, Changed) ->
     end.
 
 uppercase_bin(CP1, <<CP2/utf8, Bin/binary>>, _Changed)
-  when $a =< CP1, CP1 =< $z, CP2 < 256 ->
+  when is_integer(CP1), $a =< CP1, CP1 =< $z, CP2 < 256 ->
     [CP1-32|uppercase_bin(CP2, Bin, true)];
 uppercase_bin(CP1, <<CP2/utf8, Bin/binary>>, Changed)
-  when CP1 < 128, CP2 < 256 ->
+  when is_integer(CP1), 0 =< CP1, CP1 < 128, CP2 < 256 ->
     [CP1|uppercase_bin(CP2, Bin, Changed)];
 uppercase_bin(CP1, Bin, Changed) ->
     case unicode_util:uppercase([CP1|Bin]) of
         [CP1|CPs] ->
             case unicode_util:cp(CPs) of
-                [Next|Rest] ->
+                [Next|Rest] when is_integer(Next), Next >= 0 ->
                     [CP1|uppercase_bin(Next, Rest, Changed)];
                 [] when Changed ->
                     [CP1];
@@ -729,7 +739,7 @@ uppercase_bin(CP1, Bin, Changed) ->
             end;
         [Char|CPs] ->
             case unicode_util:cp(CPs) of
-                [Next|Rest] ->
+                [Next|Rest] when is_integer(Next), Next >= 0 ->
                     [Char|uppercase_bin(Next, Rest, true)];
                 [] ->
                     [Char];
@@ -738,9 +748,13 @@ uppercase_bin(CP1, Bin, Changed) ->
             end
     end.
 
-lowercase_list([CP1|[CP2|_]=Cont], _Changed) when $A =< CP1, CP1 =< $Z, CP2 < 256 ->
+lowercase_list([CP1|[CP2|_]=Cont], _Changed)
+  when is_integer(CP1), $A =< CP1, CP1 =< $Z,
+       is_integer(CP2), 0 =< CP2, CP2 < 256 ->
     [CP1+32|lowercase_list(Cont, true)];
-lowercase_list([CP1|[CP2|_]=Cont], Changed) when CP1 < 128, CP2 < 256 ->
+lowercase_list([CP1|[CP2|_]=Cont], Changed)
+  when is_integer(CP1), 0 =< CP1, CP1 < 128,
+       is_integer(CP2), 0 =< CP2, CP2 < 256 ->
     [CP1|lowercase_list(Cont, Changed)];
 lowercase_list([], true) ->
     [];
@@ -754,16 +768,16 @@ lowercase_list(CPs0, Changed) ->
     end.
 
 lowercase_bin(CP1, <<CP2/utf8, Bin/binary>>, _Changed)
-  when $A =< CP1, CP1 =< $Z, CP2 < 256 ->
+  when is_integer(CP1), $A =< CP1, CP1 =< $Z, CP2 < 256 ->
     [CP1+32|lowercase_bin(CP2, Bin, true)];
 lowercase_bin(CP1, <<CP2/utf8, Bin/binary>>, Changed)
-  when CP1 < 128, CP2 < 256 ->
+  when is_integer(CP1), 0 =< CP1, CP1 < 128, CP2 < 256 ->
     [CP1|lowercase_bin(CP2, Bin, Changed)];
 lowercase_bin(CP1, Bin, Changed) ->
     case unicode_util:lowercase([CP1|Bin]) of
         [CP1|CPs] ->
             case unicode_util:cp(CPs) of
-                [Next|Rest] ->
+                [Next|Rest] when is_integer(Next), Next >= 0 ->
                     [CP1|lowercase_bin(Next, Rest, Changed)];
                 [] when Changed ->
                     [CP1];
@@ -774,7 +788,7 @@ lowercase_bin(CP1, Bin, Changed) ->
             end;
         [Char|CPs] ->
             case unicode_util:cp(CPs) of
-                [Next|Rest] ->
+                [Next|Rest] when is_integer(Next), Next >= 0 ->
                     [Char|lowercase_bin(Next, Rest, true)];
                 [] ->
                     [Char];
@@ -783,9 +797,13 @@ lowercase_bin(CP1, Bin, Changed) ->
             end
     end.
 
-casefold_list([CP1|[CP2|_]=Cont], _Changed) when $A =< CP1, CP1 =< $Z, CP2 < 256 ->
+casefold_list([CP1|[CP2|_]=Cont], _Changed)
+  when is_integer(CP1), $A =< CP1, CP1 =< $Z,
+       is_integer(CP2), 0 =< CP2, CP2 < 256 ->
     [CP1+32|casefold_list(Cont, true)];
-casefold_list([CP1|[CP2|_]=Cont], Changed) when CP1 < 128, CP2 < 256 ->
+casefold_list([CP1|[CP2|_]=Cont], Changed)
+  when is_integer(CP1), 0 =< CP1, CP1 < 128,
+       is_integer(CP2), 0 =< CP2, CP2 < 256 ->
     [CP1|casefold_list(Cont, Changed)];
 casefold_list([], true) ->
     [];
@@ -799,16 +817,16 @@ casefold_list(CPs0, Changed) ->
     end.
 
 casefold_bin(CP1, <<CP2/utf8, Bin/binary>>, _Changed)
-  when $A =< CP1, CP1 =< $Z, CP2 < 256 ->
+  when is_integer(CP1), $A =< CP1, CP1 =< $Z, CP2 < 256 ->
     [CP1+32|casefold_bin(CP2, Bin, true)];
 casefold_bin(CP1, <<CP2/utf8, Bin/binary>>, Changed)
-  when CP1 < 128, CP2 < 256 ->
+  when is_integer(CP1), 0 =< CP1, CP1 < 128, CP2 < 256 ->
     [CP1|casefold_bin(CP2, Bin, Changed)];
 casefold_bin(CP1, Bin, Changed) ->
     case unicode_util:casefold([CP1|Bin]) of
         [CP1|CPs] ->
             case unicode_util:cp(CPs) of
-                [Next|Rest] ->
+                [Next|Rest] when is_integer(Next), Next >= 0 ->
                     [CP1|casefold_bin(Next, Rest, Changed)];
                 [] when Changed ->
                     [CP1];
@@ -819,7 +837,7 @@ casefold_bin(CP1, Bin, Changed) ->
             end;
         [Char|CPs] ->
             case unicode_util:cp(CPs) of
-                [Next|Rest] ->
+                [Next|Rest] when is_integer(Next), Next >= 0 ->
                     [Char|casefold_bin(Next, Rest, true)];
                 [] ->
                     [Char];
@@ -1734,7 +1752,7 @@ bin_search_str_2(Bin0, Start, Cont, First, SearchCPs) ->
     <<_:Start/binary, Bin/binary>> = Bin0,
     case binary:match(Bin, First) of
         nomatch -> {nomatch, byte_size(Bin0), Cont};
-        {Where0, _} ->
+        {Where0, _} when is_integer(Where0) ->
             Where = Start+Where0,
             <<Keep:Where/binary, Cs0/binary>> = Bin0,
             [GC|Cs]=unicode_util:gc(Cs0),
@@ -1979,7 +1997,7 @@ chars(C, N) -> chars(C, N, []).
       Tail :: string(),
       String :: string().
 
-chars(C, N, Tail) when N > 0 ->
+chars(C, N, Tail) when is_integer(N), N > 0 ->
     chars(C, N-1, [C|Tail]);
 chars(C, 0, Tail) when is_integer(C) ->
     Tail.
@@ -2109,7 +2127,7 @@ left(String, Len) when is_integer(Len) -> left(String, Len, $\s).
       Number :: non_neg_integer(),
       Character :: char().
 
-left(String, Len, Char) when is_integer(Char) ->
+left(String, Len, Char) when is_integer(Len), is_integer(Char) ->
     Slen = erlang:length(String),
     if
 	Slen > Len -> substr(String, 1, Len);
@@ -2134,7 +2152,7 @@ right(String, Len) when is_integer(Len) -> right(String, Len, $\s).
       Number :: non_neg_integer(),
       Character :: char().
 
-right(String, Len, Char) when is_integer(Char) ->
+right(String, Len, Char) when is_integer(Len), is_integer(Char) ->
     Slen = erlang:length(String),
     if
 	Slen > Len -> substr(String, Slen-Len+1);
@@ -2161,7 +2179,7 @@ centre(String, Len) when is_integer(Len) -> centre(String, Len, $\s).
 
 centre(String, 0, Char) when is_list(String), is_integer(Char) ->
     [];                       % Strange cases to centre string
-centre(String, Len, Char) when is_integer(Char) ->
+centre(String, Len, Char) when is_integer(Len), is_integer(Char) ->
     Slen = erlang:length(String),
     if
 	Slen > Len -> substr(String, (Slen-Len) div 2 + 1, Len);
@@ -2186,7 +2204,8 @@ sub_string(String, Start) -> substr(String, Start).
       Start :: pos_integer(),
       Stop :: pos_integer().
 
-sub_string(String, Start, Stop) -> substr(String, Start, Stop - Start + 1).
+sub_string(String, Start, Stop) when is_integer(Start), is_integer(Stop) ->
+    substr(String, Start, Stop - Start + 1).
 
 %% ISO/IEC 8859-1 (latin1) letters are converted, others are ignored
 %%
diff --git a/lib/stdlib/uc_spec/gen_unicode_mod.escript b/lib/stdlib/uc_spec/gen_unicode_mod.escript
index b459141d68..6f55f6da45 100644
--- a/lib/stdlib/uc_spec/gen_unicode_mod.escript
+++ b/lib/stdlib/uc_spec/gen_unicode_mod.escript
@@ -335,7 +335,7 @@ gen_norm(Fd) ->
                  "-spec nfd(unicode:chardata()) -> maybe_improper_list(gc(),unicode:chardata()) | {error, unicode:chardata()}.\n"
                  "nfd(Str0) ->\n"
                  "    case gc(Str0) of\n"
-                 "        [GC|R] when GC < 128 -> [GC|R];\n"
+                 "        [GC|R] when is_integer(GC), 0 =< GC, GC < 128 -> [GC|R];\n"
                  "        [GC|Str] -> [decompose(GC)|Str];\n"
                  "        [] -> [];\n"
                  "        {error,_}=Error -> Error\n    end.\n\n"
@@ -345,7 +345,7 @@ gen_norm(Fd) ->
                  "-spec nfkd(unicode:chardata()) -> maybe_improper_list(gc(),unicode:chardata()) | {error, unicode:chardata()}.\n"
                  "nfkd(Str0) ->\n"
                  "    case gc(Str0) of\n"
-                 "        [GC|R] when GC < 128 -> [GC|R];\n"
+                 "        [GC|R] when is_integer(GC), 0 =< GC, GC < 128 -> [GC|R];\n"
                  "        [GC|Str] -> [decompose_compat(GC)|Str];\n"
                  "        [] -> [];\n"
                  "        {error,_}=Error -> Error\n    end.\n\n"
@@ -355,7 +355,7 @@ gen_norm(Fd) ->
                  "-spec nfc(unicode:chardata()) -> maybe_improper_list(gc(),unicode:chardata()) | {error, unicode:chardata()}.\n"
                  "nfc(Str0) ->\n"
                  "    case gc(Str0) of\n"
-                 "        [GC|R] when GC < 256 -> [GC|R];\n"
+                 "        [GC|R] when is_integer(GC), 0 =< GC, GC < 256 -> [GC|R];\n"
                  "        [GC|Str] -> [compose(decompose(GC))|Str];\n"
                  "        [] -> [];\n"
                  "        {error,_}=Error -> Error\n    end.\n\n"
@@ -365,7 +365,7 @@ gen_norm(Fd) ->
                  "-spec nfkc(unicode:chardata()) -> maybe_improper_list(gc(),unicode:chardata()) | {error, unicode:chardata()}.\n"
                  "nfkc(Str0) ->\n"
                  "    case gc(Str0) of\n"
-                 "        [GC|R] when GC < 128 -> [GC|R];\n"
+                 "        [GC|R] when is_integer(GC), 0 =< GC, GC < 128 -> [GC|R];\n"
                  "        [GC|Str] -> [compose_compat_0(decompose_compat(GC))|Str];\n"
                  "        [] -> [];\n"
                  "        {error,_}=Error -> Error\n    end.\n\n"
@@ -380,7 +380,7 @@ gen_norm(Fd) ->
                  "decompose(CP) ->\n"
                  "   canonical_order(decompose_1(CP)).\n"
                  "\n"
-                 "decompose_1(CP) when 16#AC00 =< CP, CP =< 16#D7A3 ->\n"
+                 "decompose_1(CP) when is_integer(CP), 16#AC00 =< CP, CP =< 16#D7A3 ->\n"
                  "    Syll = CP-16#AC00,\n"
                  "    T = 28,\n"
                  "    N = 588,\n"
@@ -424,7 +424,7 @@ gen_norm(Fd) ->
                  "decompose_compat(CP) ->\n"
                  "   canonical_order(decompose_compat_1(CP)).\n"
                  "\n"
-                 "decompose_compat_1(CP) when 16#AC00 =< CP, CP =< 16#D7A3 ->\n"
+                 "decompose_compat_1(CP) when is_integer(CP), 16#AC00 =< CP, CP =< 16#D7A3 ->\n"
                  "    Syll = CP-16#AC00,\n"
                  "    T = 28,\n"
                  "    N = 588,\n"
@@ -442,17 +442,18 @@ gen_norm(Fd) ->
                  "    end;\n"
                  "decompose_compat_1([CP|CPs]) ->\n"
                  "    decompose_compat_1(CP) ++ decompose_compat_1(CPs);\n"
-                 "decompose_compat_1([]) -> [].\n"),
+                 "decompose_compat_1([]) -> [].\n\n"),
 
 
     io:put_chars(Fd,
                  "compose(CP) when is_integer(CP) -> CP;\n"
                  "compose([Lead,Vowel|Trail]) %% Hangul\n"
-                 "  when 16#1100 =< Lead, Lead =< 16#1112 ->\n"
+                 "  when is_integer(Lead), 16#1100 =< Lead, Lead =< 16#1112, is_integer(Vowel) ->\n"
                  "    if 16#1161 =< Vowel, Vowel =< 16#1175 ->\n"
                  "            CP = 16#AC00 + ((Lead - 16#1100) * 588) + ((Vowel - 16#1161) * 28),\n"
                  "            case Trail of\n"
-                 "                [T|Acc] when 16#11A7 =< T, T =< 16#11C2 -> nolist(CP+T-16#11A7,Acc);\n"
+                 "                [T|Acc] when is_integer(T), 16#11A7 =< T, T =< 16#11C2 ->"
+                 "                     nolist(CP+T-16#11A7,Acc);\n"
                  "                Acc -> nolist(CP,Acc)\n"
                  "            end;\n"
                  "       true ->\n"
@@ -494,11 +495,12 @@ gen_norm(Fd) ->
                  "    end.\n\n"
                  "compose_compat(CP) when is_integer(CP) -> CP;\n"
                  "compose_compat([Lead,Vowel|Trail]) %% Hangul\n"
-                 "  when 16#1100 =< Lead, Lead =< 16#1112 ->\n"
+                 "  when is_integer(Lead), 16#1100 =< Lead, Lead =< 16#1112, is_integer(Vowel) ->\n"
                  "    if 16#1161 =< Vowel, Vowel =< 16#1175 ->\n"
                  "            CP = 16#AC00 + ((Lead - 16#1100) * 588) + ((Vowel - 16#1161) * 28),\n"
                  "            case Trail of\n"
-                 "                [T|Acc] when 16#11A7 =< T, T =< 16#11C2 -> nolist(CP+T-16#11A7,Acc);\n"
+                 "                [T|Acc] when is_integer(T), 16#11A7 =< T, T =< 16#11C2 ->"
+                 "                    nolist(CP+T-16#11A7,Acc);\n"
                  "                Acc -> nolist(CP,Acc)\n"
                  "            end;\n"
                  "       true ->\n"
@@ -634,12 +636,12 @@ gen_gc(Fd, GBP) ->
                  "        [$\\n|R1] -> [[$\\r,$\\n]|R1];\n"
                  "        T -> [CP|T]\n"
                  "    end;\n"
-                 "gc([CP1|T1]=T) when CP1 < 256 andalso ?IS_CP(CP1) ->\n"
+                 "gc([CP1|T1]=T) when ?IS_CP(CP1), CP1 < 256 ->\n"
                  "    case T1 of\n"
-                 "        [CP2|_] when CP2 < 256 -> T; %% Ascii Fast path\n"
+                 "        [CP2|_] when is_integer(CP2), 0 =< CP2, CP2 < 256 -> T; %% Ascii Fast path\n"
                  "        _ -> %% Keep the tail binary.\n"
                  "            case cp_no_bin(T1) of\n"
-                 "                [CP2|_]=T3 when CP2 < 256 -> [CP1|T3]; %% Asciii Fast path\n"
+                 "                [CP2|_]=T3 when is_integer(CP2), 0 =< CP2, CP2 < 256 -> [CP1|T3]; %% Asciii Fast path\n"
                  "                binary_found -> gc_1(T);\n"
                  "                T4 -> gc_1([CP1|T4])\n"
                  "            end\n"
@@ -682,13 +684,14 @@ gen_gc(Fd, GBP) ->
     io:put_chars(Fd, "\n%% Optimize Latin-1\n"),
     [GenExtP(CP) || CP <- merge_ranges(ExtendedPictographicLow)],
 
-    io:format(Fd,
-              "gc_1([CP|R]=R0) when CP < 256 ->\n"
-              "    case R of\n"
-              "        [CP2|_] when CP2 < 256 -> R0;\n"
-              "        _ -> gc_extend(cp(R), R, CP)\n"
-              "    end;\n",
-              []),
+    io:put_chars(Fd,
+                 "gc_1([CP|R]=R0) when is_integer(CP), 0 =< CP, CP < 256 ->\n"
+                 "    case R of\n"
+                 "        [CP2|_] when is_integer(CP2), 0 =< CP2, CP2 < 256 -> R0;\n"
+                 "        _ -> gc_extend(cp(R), R, CP)\n"
+                 "    end;\n"
+                 "gc_1([CP|_]) when not ?IS_CP(CP) ->\n"
+                 "    error({badarg,CP});\n"),
     io:put_chars(Fd, "\n%% Continue control\n"),
     [GenControl(CP) || CP <- Crs],
     %% One clause per CP
@@ -709,7 +712,7 @@ gen_gc(Fd, GBP) ->
     GenHangulT = fun(Range) -> io:format(Fd, "gc_1~s gc_h_T(R1,[CP]);\n", [gen_clause(Range)]) end,
     [GenHangulT(CP) || CP <- merge_ranges(maps:get(t,GBP))],
     io:put_chars(Fd, "%% Handle Hangul LV and LVT special, since they are large\n"),
-    io:put_chars(Fd, "gc_1([CP|_]=R0) when 44000 < CP, CP < 56000 -> gc_h_lv_lvt(R0, R0, []);\n"),
+    io:put_chars(Fd, "gc_1([CP|_]=R0) when is_integer(CP), 44000 < CP, CP < 56000 -> gc_h_lv_lvt(R0, R0, []);\n"),
 
     io:put_chars(Fd, "\n%% Handle Regional\n"),
     GenRegional = fun(Range) -> io:format(Fd, "gc_1~s gc_regional(R1,CP);\n", [gen_clause(Range)]) end,
@@ -825,7 +828,9 @@ gen_gc(Fd, GBP) ->
     [{RLess,RLarge}] = merge_ranges(maps:get(regional_indicator,GBP)),
     io:put_chars(Fd,"gc_regional(R0, CP0) ->\n"
                  "    case cp(R0) of\n"),
-    io:format(Fd,   "        [CP|R1] when ~w =< CP,CP =< ~w-> gc_extend2(cp(R1),R1,[CP,CP0]);~n",[RLess, RLarge]),
+    io:format(Fd,   "        [CP|R1] when is_integer(CP), ~w =< CP, CP =< ~w ->\n"
+              "             gc_extend2(cp(R1),R1,[CP,CP0]);~n",
+              [RLess, RLarge]),
     io:put_chars(Fd,"        R1 -> gc_extend(R1, R0, CP0)\n"
                  "    end.\n\n"),
 
@@ -893,7 +898,8 @@ gen_compose_pairs(Fd, ExclData, Data) ->
     [io:format(Fd, "compose_pair(~w,~w) -> ~w;~n", [A,B,CP]) || {[A,B],CP} <- lists:sort(DeCmp2)],
     io:put_chars(Fd, "compose_pair(_,_) -> false.\n\n"),
 
-    io:put_chars(Fd, "nolist(CP, []) -> CP;\nnolist(CP,L) -> [CP|L].\n\n"),
+    io:put_chars(Fd, "nolist(CP, []) when ?IS_CP(CP) -> CP;\n"
+                 "nolist(CP, L) when ?IS_CP(CP) -> [CP|L].\n\n"),
     ok.
 
 gen_case_table(Fd, Data) ->
@@ -1164,23 +1170,23 @@ gen_width_table(Fd, WideChars) ->
 gen_clause({R0, undefined}) ->
     io_lib:format("([~w=CP|R1]=R0) ->", [R0]);
 gen_clause({R0, R1}) ->
-    io_lib:format("([CP|R1]=R0) when ~w =< CP, CP =< ~w ->", [R0,R1]).
+    io_lib:format("([CP|R1]=R0) when is_integer(CP), ~w =< CP, CP =< ~w ->", [R0,R1]).
 
 gen_clause2({R0, undefined}) ->
     io_lib:format("([~w=CP|R1], R0, Acc) ->", [R0]);
 gen_clause2({R0, R1}) ->
-    io_lib:format("([CP|R1], R0, Acc) when ~w =< CP, CP =< ~w ->", [R0,R1]).
+    io_lib:format("([CP|R1], R0, Acc) when is_integer(CP), ~w =< CP, CP =< ~w ->", [R0,R1]).
 
 gen_case_clause({R0, undefined}) ->
     io_lib:format("[~w=CP|R1] ->", [R0]);
 gen_case_clause({R0, R1}) ->
-    io_lib:format("[CP|R1] when ~w =< CP, CP =< ~w ->", [R0,R1]).
+    io_lib:format("[CP|R1] when is_integer(CP), ~w =< CP, CP =< ~w ->", [R0,R1]).
 
 
 gen_single_clause({R0, undefined}) ->
     io_lib:format("(~w) ->", [R0]);
 gen_single_clause({R0, R1}) ->
-    io_lib:format("(CP) when ~w =< CP, CP =< ~w ->", [R0,R1]).
+    io_lib:format("(CP) when is_integer(CP), ~w =< CP, CP =< ~w ->", [R0,R1]).
 
 
 merge_ranges(List) ->
-- 
2.35.3

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File 5587-string-unicode_util-Stricten-tests-for-integers.patch of Package erlang (Revision 3e53aa07e56d6cc0c5ffbbfd2f14b043)

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