Passing an expression `expr` that evaluates to a store path to any built-in function which reads from the filesystem constitutes IFD(Import From Derivation).
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e7068276 (1st chunk of `pkgs/by-name/te/textlint-rule-abbr-within-parentheses/test.md`)
Title: Import From Derivation (IFD) Definition
Summary
Import From Derivation (IFD) occurs when a built-in function reads from the filesystem using an expression that evaluates to a store path.