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reference/with_labels.md

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+# Evaluate an expression while preserving column labels
+
+Snapshots labels from `df` before evaluating `expr`, then reapplies them
+to matching columns in the result. New columns created inside `expr`
+receive no label automatically.
+
+## Usage
+
+``` r
+with_labels(df, expr)
+```
+
+## Arguments
+
+- df:
+
+  A data frame carrying `"label"` attributes.
+
+- expr:
+
+  An unquoted expression that transforms `df` and returns a data frame.
+
+## Value
+
+The data frame produced by `expr`, with original labels restored.