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Less.js fails to parse valid CSS/Less when unknown at-rules or custom properties contain strings with…

Less.js fails to parse valid CSS/Less when unknown at-rules or custom properties contain strings with…: a task in LegoFlow-SWE (Harbor dataset). When using unknown at-rules (e.g., browser-specific rules like @-moz-document ) with function-like syntax containing quoted strings, the parser fails…

The task

When using unknown at-rules (e.g., browser-specific rules like `@-moz-document`) with function-like syntax containing quoted strings, the parser fails because it tries to interpret `{` and `}` characters inside the quoted string as block delimiters:

Part of Lego-X/LegoFlow-SWE.