libexpr: add set-to-string error frame

this is much more useful than a frame pointing to the set but claiming it as a function being called. if the function is actually at fault we will now point to its attribute, although the position may be slightly wrong if __toString was defined from set updates or builtin functions. Change-Id: Ib3eb237a276d94426d9c6fc0e26eea72382d34a2
2025-04-27 11:01:22 +00:00
parent 9d761ed5c1
commit eb0280f715
4 changed files with 84 additions and 4 deletions
@@ -0,0 +1,14 @@
+error:
+       … while calling the 'toString' builtin
+         at /pwd/lang/eval-fail-toString.nix:1:1:
+            1| toString { __toString = 1; }
+             | ^
+            2|
+
+       … while converting a set to string
+
+       error: attempt to call something which is not a function but an integer: 1
+       at /pwd/lang/eval-fail-toString.nix:1:12:
+            1| toString { __toString = 1; }
+             |            ^
+            2|