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-rw-r--r--src/libexpr/eval.hh1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index cbdcb274e..8070f4884 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -55,6 +55,7 @@ Expr evalFile(EvalState & state, const Path & path);
/* Specific results. */
string evalString(EvalState & state, Expr e);
Path evalPath(EvalState & state, Expr e);
+bool evalBool(EvalState & state, Expr e);
ATermList evalList(EvalState & state, Expr e);
ATerm coerceToString(Expr e);