reported by Siddhant Saraf in
> [ngspice:discussion] "out of memory" error : simulating a 2bit AND gate"
This comes in two flavours,
1) an empty circuit
2) a xspice circuit with exclusively xspice event nodes
check xpressn.c parser capability to parse {2--3}
check .control parser capability to parse 2--3
check B parser capability to parse 2--3
check echo commands capability to print "--"
check echo commands capability to print upper and lower case
check xpressn.c parser capabilities
check precision of some transcendental functions