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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-indented/eval-okay-escapes.err.exp
+5 -5
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@@ -1,10 +1,10 @@
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 can simply write it as \a in the string. Use --extra-deprecated-features broken-string-escape to silence this warning.
at /pwd/in.nix:2:4:
1| ''
2| ''\a''\n
| ^
3| ''\f''\{''\$''\"''\'''\r''\v''\\''\t
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 can simply write it as \f in the string. Use --extra-deprecated-features broken-string-escape to silence this warning.
at /pwd/in.nix:3:4:
2| ''\a''\n
3| ''\f''\{''\$''\"''\'''\r''\v''\\''\t
@@ -22,19 +22,19 @@ warning: ''\$ is an ill-defined escape. You can drop the ''\ and simply write $
3| ''\f''\{''\$''\"''\'''\r''\v''\\''\t
| ^
4| ''\'''${"x"}
warning: ''\" is an ill-defined escape. You can drop the ''\ and simply write " instead. Use --extra-deprecated-features broken-string-escape to silence this warning.
warning: ''\" is an ill-defined escape sequence. In Nix, it simply means ", therefore the ''\ is redundant and should be removed. If the intent of the string was to mean \" instead (e.g. in a regex), you can simply write it as \" in the string. Use --extra-deprecated-features broken-string-escape to silence this warning.
at /pwd/in.nix:3:16:
2| ''\a''\n
3| ''\f''\{''\$''\"''\'''\r''\v''\\''\t
| ^
4| ''\'''${"x"}
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 can simply write it as \v in the string. Use --extra-deprecated-features broken-string-escape to silence this warning.
at /pwd/in.nix:3:28:
2| ''\a''\n
3| ''\f''\{''\$''\"''\'''\r''\v''\\''\t
| ^
4| ''\'''${"x"}
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 can simply write it as \\ in the string. Use --extra-deprecated-features broken-string-escape to silence this warning.
at /pwd/in.nix:3:32:
2| ''\a''\n
3| ''\f''\{''\$''\"''\'''\r''\v''\\''\t