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-rw-r--r--src/libexpr/nixexpr-ast.def3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/libexpr/nixexpr-ast.def b/src/libexpr/nixexpr-ast.def
index c7029e927047..a06d34311ae1 100644
--- a/src/libexpr/nixexpr-ast.def
+++ b/src/libexpr/nixexpr-ast.def
@@ -46,6 +46,9 @@ Int | int | Expr |
 Str | string ATermList | Expr |
 Str | string | Expr | ObsoleteStr
 
+# Internal to the parser, doesn't occur in ASTs.
+IndStr | string | Expr |
+
 # A path is a reference to a file system object that is to be copied
 # to the Nix store when used as a derivation attribute.  When it is
 # concatenated to a string (i.e., `str + path'), it is also copied and