Add explicit METHOD to SOLVE when target is a DERIVATIVE block #3601
Description
Overview of the feature
The following mod file is valid in NOCMODL:
NEURON {
SUFFIX test
}
BREAKPOINT {
SOLVE states
}
STATE {
n
}
INITIAL {
n = 1
}
DERIVATIVE states {
n' = -n
}
Unfortunately, NMODL does not work:
[NMODL] [error] :: SympySolverVisitor :: Solve method not supported
[NMODL] [error] :: NeuronSolveVisitor :: solver method '' not supported
NOCMODL actually implicitly converts the SOLVE states statement into SOLVE states METHOD derivimplicit. NMODL should match this behavior.