wasmparser reports incorrect arity for end instruction for if with no else? #2235
Description
Given the following Wasm module, wasmparser reports the if's end as popping 2 values and pushing 2 values, but I think it should be popping and pushing 1 value, no?
(module
(func (export "f") (param i64 i32) (result i64)
(local.get 0)
(local.get 1)
;; If with no else. Same number of params and results.
(if (param i64) (result i64)
(then
(drop)
(i64.const -1)
)
)
)
)cc @keithw