Charging an ideal capacitor through an ideal diode, forever
The Shockley diode equation yields non-zero current for non-zero voltage, therefore the capacitor will charge up as long as there is a difference between capacitor and source voltage (\$V_C &lt; V_1\$), i.e. \$V_C\$ will get arbitrarily close to \$V_1\$ if you just wait long enough.