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docs(macros): remove sentences banning usage of as _ (#1619)

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* docs(macros): remove sentents banning `as _`

* fix(macros): comment

* Update src/macros.rs

* Update src/macros.rs

Co-authored-by: keijun-kumagai <keijun.kumagai@dena.com>
Co-authored-by: Austin Bonander <austin.bonander@gmail.com>
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k-jun 2022-02-16 14:13:39 +09:00 committed by GitHub
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src/macros.rs
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@ -147,10 +147,9 @@
/// sqlx::query!("select $1::int4 as id", my_int as MyInt4)
/// ```
///
/// In Rust 1.45 we can eliminate this redundancy by allowing casts using `as _` or type ascription
/// syntax, i.e. `my_int: _` (which is unstable but can be stripped), but this requires modifying
/// the expression which is not possible as the macros are currently implemented. Casts to `_` are
/// forbidden for now as they produce rather nasty type errors.
/// Using `expr as _` or `expr : _` simply signals to the macro to not type-check that bind expression,
/// and then that syntax is stripped from the expression so as to not trigger type errors
/// (or an unstable syntax feature in the case of the latter, which is called type ascription).
///
/// ## Type Overrides: Output Columns
/// Type overrides are also available for output columns, utilizing the SQL standard's support