I can't get the hover infomation with using rust_analyzer api.

[baiguoname]

I have the following codeblock:

let a = 1; 

I try to hover the information of let out, suppose the let's textrange is 0..3, then I do this (su-do code):
api.hover(source_file_id, TextRange(0, 3)), but the returned result is not from let, but from it's parent block. What am I doing wrong with the method hover?

[Veykril]

You want to call api.hover(source_file_id, TextRange(0, 0)) (or 1,1 or 2,2). If you pass a non-empty range r-a will do a so called ranged hover which fetches the nearest expression and returns a type hover for that expression instead.

[baiguoname]

Thanks you so so so much!