def env_gen(env_type, depth):
# copy tuple, then add a fresh row type variable
var = row.Var(depth)
if type(env_type) is row.Empty:
gen_type = var
else:
gen_type = row.record( *tuple(iter(env_type) ) )
gen_type.set_terminator(var)
return gen_type
def row_gen(state, node):
# this will row-generalize type for node
node_type = expr(state, node.expr)
assert type(node_type) in row.types, "closure env should be a record: {0}".format(node_type.show())
# copy tuple, then add a fresh row type variable
var = row.Var(state.depth)
if type(node_type) is row.Empty:
gen_type = var
else:
gen_type = row.record(*tuple(iter(node_type)))
gen_type.set_terminator(var)
tool.debug("gen_type:", gen_type.show())
return gen_type