Fix runtime error

tobiasdiez · tobiasdiez · commit 31147b7a0a56 · 2025-06-09T20:39:07.000+02:00
diff --git a/src/sage/doctest/rif_tol.py b/src/sage/doctest/rif_tol.py
@@ -27,7 +27,7 @@
 from sage.doctest.marked_output import MarkedOutput
 from sage.rings.real_mpfi import RealIntervalField, RealIntervalFieldElement
 
-_RIFtol: RealIntervalField | None = None
+_RIFtol: 'RealIntervalField | None' = None
 
 
 def RIFtol(*args) -> RealIntervalFieldElement:
