Merge pull request #10305 from hercules-ci/addErrorContext-is-great

Always print addErrorContext

tests/functional/lang/eval-fail-addErrorContext-example.err.exp

@@ -0,0 +1,24 @@
+error:
+       … while counting down; n = 10
+
+       … while counting down; n = 9
+
+       … while counting down; n = 8
+
+       … while counting down; n = 7
+
+       … while counting down; n = 6
+
+       … while counting down; n = 5
+
+       … while counting down; n = 4
+
+       … while counting down; n = 3
+
+       … while counting down; n = 2
+
+       … while counting down; n = 1
+
+       (stack trace truncated; use '--show-trace' to show the full, detailed trace)
+
+       error: kaboom

tests/functional/lang/eval-fail-addErrorContext-example.flags

@@ -0,0 +1 @@
+--eval --strict --no-show-trace

tests/functional/lang/eval-fail-addErrorContext-example.nix

@@ -0,0 +1,9 @@
+let
+  countDown = n:
+    if n == 0
+    then throw "kaboom"
+    else
+      builtins.addErrorContext
+        "while counting down; n = ${toString n}"
+        ("x" + countDown (n - 1));
+in countDown 10