Fix incorrect compiling when variable-length lookbehind's first branch was not the shortest and there was a backreference to a groupwithin the lookbehind.
Cherry-picked from 4a6a8b056f39079d5e958eac84c2ad173f4680bc.
diff --git a/src/pcre2_compile.c b/src/pcre2_compile.c
index 8b36497..71c2dbc 100644
--- a/src/pcre2_compile.c
+++ b/src/pcre2_compile.c
@@ -9908,7 +9908,7 @@
*bptr |= branchlength; /* branchlength never more than 65535 */
bptr = *pptrptr;
}
-while (*bptr == META_ALT);
+while (META_CODE(*bptr) == META_ALT);
/* If any branch is of variable length, the whole lookbehind is of variable
length. If the maximum length of any branch exceeds the maximum for variable
diff --git a/testdata/testinput2 b/testdata/testinput2
index 9760854..9b4c068 100644
--- a/testdata/testinput2
+++ b/testdata/testinput2
@@ -6099,4 +6099,8 @@
/(a(?1)z||(?1)++)$/
abcd\=disable_recurseloop_check
+/(((?<=123?456456|ABC)))(?<=\2)../
+ ABCDEFG
+ 12345645678910
+
# End of testinput2
diff --git a/testdata/testoutput2 b/testdata/testoutput2
index ee1f70b..30c5a83 100644
--- a/testdata/testoutput2
+++ b/testdata/testoutput2
@@ -18038,6 +18038,16 @@
0:
1:
+/(((?<=123?456456|ABC)))(?<=\2)../
+ ABCDEFG
+ 0: DE
+ 1:
+ 2:
+ 12345645678910
+ 0: 78
+ 1:
+ 2:
+
# End of testinput2
Error -70: PCRE2_ERROR_BADDATA (unknown error number)
Error -62: bad serialized data
