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parser: improve error message for ill-defined escape sequences

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fixes #1169

Change-Id: Ic93e0cb5442b717964de3ae9eb22f4cd48e4ad0a
This commit is contained in:
rootile
2026-06-25 21:03:09 +00:00
committed by eldritch horrors
parent de68de1d11
commit fce63f6dbf
3 changed files with 21 additions and 11 deletions
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tests/functional2/lang/string/eval-okay-escapes.err.exp
+4 -4
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@@ -1,4 +1,4 @@
warning: \a is an ill-defined escape. You can drop the \ and simply write a instead. Use --extra-deprecated-features broken-string-escape to silence this warning.
warning: \a is an ill-defined escape sequence. In Nix, it simply means a, therefore the \ is redundant and should be removed. If the intent of the string was to mean \a instead (e.g. in a regex), you need to escape the \ itself: \\a. Use --extra-deprecated-features broken-string-escape to silence this warning.
at /pwd/in.nix:1:3:
1| "\a\n\{\$\"\'\r\v\\\t
| ^
@@ -8,17 +8,17 @@ warning: \{ is an ill-defined escape. You can drop the \ and simply write { inst
1| "\a\n\{\$\"\'\r\v\\\t
| ^
2| \f"
warning: \' is an ill-defined escape. You can drop the \ and simply write ' instead. Use --extra-deprecated-features broken-string-escape to silence this warning.
warning: \' is an ill-defined escape sequence. In Nix, it simply means ', therefore the \ is redundant and should be removed. If the intent of the string was to mean \' instead (e.g. in a regex), you need to escape the \ itself: \\'. Use --extra-deprecated-features broken-string-escape to silence this warning.
at /pwd/in.nix:1:13:
1| "\a\n\{\$\"\'\r\v\\\t
| ^
2| \f"
warning: \v is an ill-defined escape. You can drop the \ and simply write v instead. Use --extra-deprecated-features broken-string-escape to silence this warning.
warning: \v is an ill-defined escape sequence. In Nix, it simply means v, therefore the \ is redundant and should be removed. If the intent of the string was to mean \v instead (e.g. in a regex), you need to escape the \ itself: \\v. Use --extra-deprecated-features broken-string-escape to silence this warning.
at /pwd/in.nix:1:17:
1| "\a\n\{\$\"\'\r\v\\\t
| ^
2| \f"
warning: \f is an ill-defined escape. You can drop the \ and simply write f instead. Use --extra-deprecated-features broken-string-escape to silence this warning.
warning: \f is an ill-defined escape sequence. In Nix, it simply means f, therefore the \ is redundant and should be removed. If the intent of the string was to mean \f instead (e.g. in a regex), you need to escape the \ itself: \\f. Use --extra-deprecated-features broken-string-escape to silence this warning.
at /pwd/in.nix:2:2:
1| "\a\n\{\$\"\'\r\v\\\t
2| \f"