Error: Cannot swap Variable value23 with Slot 0x20: too deep in the stack by 9 slots in [ RET value23 value22 value21 value20 value19 value18 value17 value16 value15 value14 value13 value12 value11 value10 value9 value8 value7 value6 value5 value4 value3 value2 value1 value0 pos 0x20 ]
memoryguard was present.
 --> input.sol:1:1:
  |
1 | contract C {
  | ^ (Relevant source part starts here and spans across multiple lines).
