From bed8270c0cbaa3007621ad2f0e722abcefe79702 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Mon, 24 Jan 2022 15:18:18 +0100
Subject: Fix parsing of variable names that are a prefix of '__curPos'

Fixes

  $ nix-instantiate --parse -E 'x: with x; _'
  (x: (with x; __curPos))
---
 src/libexpr/parser.y | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src/libexpr')

diff --git a/src/libexpr/parser.y b/src/libexpr/parser.y
index a3e713937..55f8abcb7 100644
--- a/src/libexpr/parser.y
+++ b/src/libexpr/parser.y
@@ -404,7 +404,8 @@ expr_select
 
 expr_simple
   : ID {
-      if (strncmp($1.p, "__curPos", $1.l) == 0)
+      std::string_view s = "__curPos";
+      if (strncmp($1.p, s.data(), s.size()) == 0)
           $$ = new ExprPos(CUR_POS);
       else
           $$ = new ExprVar(CUR_POS, data->symbols.create($1));
-- 
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