merge revision(s) 17b0643392749f45b7aacb64fc1c1bd704d42b4c: [Backport #19924]

	[Bug #19924] Source code should be unsigned char stream

	Use `peekc` or `nextc` to fetch the next character, instead of reading
	from `lex.pcur` directly, for compilers that plain char is signed.
	---
	 parse.y                 | 10 +++++-----
	 test/ruby/test_parse.rb |  2 ++
	 2 files changed, 7 insertions(+), 5 deletions(-)

1 files changed, 5 insertions, 5 deletions

diff --git a/parse.y b/parse.y
index f6cb9d1521..d58fa6e0b7 100644
--- a/parse.y
+++ b/parse.y
@@ -7286,9 +7286,9 @@ tokadd_utf8(struct parser_params *p, rb_encoding **encp,
              * invalid unicode escapes are allowed in comments. The regexp parser
              * does its own validation and will catch any issues.
              */
-            int c = *p->lex.pcur;
-            tokadd(p, c);
-            for (c = *++p->lex.pcur; p->lex.pcur < p->lex.pend; c = *++p->lex.pcur) {
+            tokadd(p, open_brace);
+            while (++p->lex.pcur < p->lex.pend) {
+                int c = peekc(p);
                 if (c == close_brace) {
                     tokadd(p, c);
                     ++p->lex.pcur;
@@ -7678,7 +7678,7 @@ tokadd_string(struct parser_params *p,
 	    --*nest;
 	}
 	else if ((func & STR_FUNC_EXPAND) && c == '#' && p->lex.pcur < p->lex.pend) {
-	    int c2 = *p->lex.pcur;
+	    unsigned char c2 = *p->lex.pcur;
 	    if (c2 == '$' || c2 == '@' || c2 == '{') {
 		pushback(p, c);
 		break;
@@ -9313,7 +9313,7 @@ parse_qmark(struct parser_params *p, int space_seen)
 	    enc = rb_utf8_encoding();
 	    tokadd_utf8(p, &enc, -1, 0, 0);
 	}
-	else if (!lex_eol_p(p) && !(c = *p->lex.pcur, ISASCII(c))) {
+        else if (!ISASCII(c = peekc(p))) {
 	    nextc(p);
 	    if (tokadd_mbchar(p, c) == -1) return 0;
 	}