Rust errors / Attributes, macros and features
Rust compiler error · checked with rustc 1.99.0
Rust error E0805: malformed `inline` attribute input
What it meansAn attribute was given an invalid number of arguments
What rustc prints
error[E0805]: malformed `inline` attribute input --> main.rs:1:3 | 1 | #[inline()] // error! should either have a single argument, or no parentheses | ^^^^^^-- | | | expected an argument here | = note: for more information, visit <https://doc.rust-lang.org/reference/attributes/codegen.html#the-inline-attribute> help: try changing it to one of the following valid forms of the attribute | 1 - #[inline()] // error! should either have a single argument, or no parentheses 1 + #[inline] // error! should either have a single argument, or no parentheses | 1 | #[inline(always)] // error! should either have a single argument, or no parentheses | ++++++ 1 | #[inline(never)] // error! should either have a single argument, or no parentheses | +++++
Real output of rustc 1.99.0 compiling the official example below (2021 edition). Your names and line numbers will differ; the first line is the part to match.
E0805Attributes, macros and features
Activein rustc 1.99.0
4related errors linked below
The compiler team's explanation
An attribute was given an invalid number of arguments
Erroneous code example:
#[inline()] // error! should either have a single argument, or no parentheses
fn foo() {}
#[inline(always, never)] // error! should have only one argument, not two
fn bar() {}To fix this, either give the right number of arguments the attribute needs. In the case of inline, this could be none at all:
#[inline]
fn foo() {}or only one:
#[inline(always)]
fn foo() {}From rustc --explain E0805 (1.99.0), part of the Rust project, MIT or Apache-2.0. Official page.
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