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libexpr: Warn on incorrect string escapes

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In Nixpkgs, there are several strings like "\d\.\d" which attempt to be
a regex but are just literally "d.d". The escaping rules are silly and
we should warn our users about that.

Co-authored-by: Commentator2.0 <lix@crystal-cavern.systems>
Change-Id: I779b0757358fc9adc34dc140e1670b83abc93b67
This commit is contained in:
piegames
2026-01-31 15:32:27 +01:00
co-authored by Commentator2.0
parent f1fbd1d095
commit 56dee9186f
18 changed files with 158 additions and 9 deletions
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tests/functional2/lang/string-indented/test.toml
+3 -2
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@@ -1,12 +1,13 @@
[[test]]
runner = "eval-okay"
matrix = true
flags = ["--extra-deprecated-features", "broken-string-indentation"]
flags = ["--extra-deprecated-features", "broken-string-indentation broken-string-escape"]
[[test]]
name = "depr-warning"
runner = "eval-okay"
in = "in.nix"
matrix = true
in = ["in.nix", "in-escapes.nix"]
[[test]]
runner = "parse-okay"