From 35713fe79b767de79a44e3925db3536bc750c214 Mon Sep 17 00:00:00 2001
From: John Wiegley <johnw@newartisans.com>
Date: Mon, 23 Jan 2023 15:42:25 -0800
Subject: Disallow numbers in function names

---
 NEWS.md      | 2 ++
 src/token.cc | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/NEWS.md b/NEWS.md
index ac407e11..e2cc44ca 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -44,6 +44,8 @@
   to include for stdin (`-f -`). Also for `-f -` when `include` cannot find the
   file it reports the error with full path now. (bug #2057 & bug #2092)
 
+- Numbers are no longer permitted in value expression function names.
+
 - Various documentation improvements
 
 ## 3.2.1 (2020-05-18)
diff --git a/src/token.cc b/src/token.cc
index 01ee2a18..148fbb10 100644
--- a/src/token.cc
+++ b/src/token.cc
@@ -133,7 +133,7 @@ void expr_t::token_t::parse_ident(std::istream& in)
 
   int c;
   char buf[256];
-  READ_INTO_(in, buf, 255, c, length, std::isalnum(c) || c == '_');
+  READ_INTO_(in, buf, 255, c, length, std::isalpha(c) || c == '_');
 
   value.set_string(buf);
 }
-- 
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