The inline attribute was malformed.
Erroneous code example:
#[inline()] // error: expected one argument
pub fn something() {}
fn main() {}The parenthesized inline attribute requires the parameter to be specified:
#[inline(always)]
fn something() {}or:
#[inline(never)]
fn something() {}Alternatively, a paren-less version of the attribute may be used to hint the compiler about inlining opportunity:
#[inline]
fn something() {}For more information see the inline attribute section
of the Reference.