patch 8.2.1870: Vim9: no need to keep all script variables
Problem: Vim9: no need to keep all script variables.
Solution: Only keep script variables when a function was defined that could
use them. Fix freeing static string on exit.
diff --git a/src/structs.h b/src/structs.h
index 4520e76..eb86e48 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -917,6 +917,8 @@
# define CSF_SILENT 0x1000 // "emsg_silent" reset by ":try"
// Note that CSF_ELSE is only used when CSF_TRY and CSF_WHILE are unset
// (an ":if"), and CSF_SILENT is only used when CSF_TRY is set.
+//
+#define CSF_FUNC_DEF 0x2000 // a function was defined in this block
/*
* What's pending for being reactivated at the ":endtry" of this try