Elif and optional else not working

[wader]

Describe the bug

if has an optional else clause but it seems to not work in combination with one or more elif clauses.

To Reproduce

$ jq --version
jq-1.6-159-gcff5336

$ jq -n '1,2,3 | if . == 1 then 1 elif . == 2 then 2 end'
jq: error: syntax error, unexpected end (Unix shell quoting issues?) at <top-level>, line 1:
1,2,3 | if . == 1 then 1 elif . == 2 then 2 end
jq: error: Possibly unterminated 'if' statement at <top-level>, line 1:
1,2,3 | if . == 1 then 1 elif . == 2 then 2 end
jq: 2 compile errors

Expected behavior

$ jq -n '1,2,3 | if . == 1 then 1 elif . == 2 then 2 end'
1
2
3

Same as 1,2,3 | if . == 1 then 1 elif . == 2 then 2 else . end

Environment:

jq-1.6-159-gcff5336

Additional context

gojq supports optional else in combination with elif:s.