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The `inline` attribute was malformed.
Erroneous code example:
```compile_fail,E0534
#[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][inline-attribute] section
of the Reference.
[inline-attribute]: https://doc.rust-lang.org/reference/attributes/codegen.html#the-inline-attribute
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