src/sage/env.py: Hide a legitimate .all import from relint

Author: Matthias Koeppe

src/sage/env.py

@@ -11,7 +11,8 @@
 
     sage: env = {k:v for (k,v) in os.environ.items() if not k.startswith("SAGE_")}
     sage: from subprocess import check_output
-    sage: cmd = "from sage.all import SAGE_ROOT, SAGE_LOCAL; print((SAGE_ROOT, SAGE_LOCAL))"
+    sage: environment = "sage.all"
+    sage: cmd = f"from {environment} import SAGE_ROOT, SAGE_LOCAL; print((SAGE_ROOT, SAGE_LOCAL))"
     sage: out = check_output([sys.executable, "-c", cmd], env=env).decode().strip()   # long time
     sage: out == repr((SAGE_ROOT, SAGE_LOCAL))                                        # long time
     True