About use query! and query_as!

[moom-en]

Bug Description

let mut sql = String::from("select * from user");
// append sql content
...
let arr = sqlx::query!(sql.as_str()).fetch_all(pool).await?;（error: expected string literal）
but：
let arr = sqlx::query!("select * from user").fetch_all(pool).await?;（it's ok）

Minimal Reproduction

A small code snippet or a link to a Github repo or Gist, with instructions on reproducing the bug.

Info

• SQLx version: 0.7.2
• SQLx features enabled: runtime-tokio、mysql
• Database server and version: MySQL
• Operating system: windows 10
• rustc --version: 1.73.0

[moom-en]

I want dynamics append sql content, rather than fixed content

[abonander]

Duplicate of #1488