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add doc comment justifying ExprInheritFrom

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Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>
(cherry picked from commit f24e445bc024cfd3c26be5f061280af549321c22)
Change-Id: I7acda5d5c34c0914a78adc2385d32782c4c275cd
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eldritch horrors 2024-03-08 09:52:42 +01:00
parent 06764118ea
commit 0a4737f519
1 changed files with 5 additions and 0 deletions
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5
src/libexpr/nixexpr.hh
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@ -129,6 +129,11 @@ struct ExprVar : Expr
COMMON_METHODS COMMON_METHODS
}; };
/**
* A pseudo-expression for the purpose of evaluating the `from` expression in `inherit (from)` syntax.
* Unlike normal variable references, the displacement is set during parsing, and always refers to
* `ExprAttrs::inheritFromExprs` (by itself or in `ExprLet`), whose values are put into their own `Env`.
*/
struct ExprInheritFrom : ExprVar struct ExprInheritFrom : ExprVar
{ {
ExprInheritFrom(PosIdx pos, Displacement displ): ExprVar(pos, {}) ExprInheritFrom(PosIdx pos, Displacement displ): ExprVar(pos, {})