An inner doc comment was used in an invalid context.
Erroneous code example:
fn foo() {}
//! foo
// ^ error!
fn main() {}Inner document can only be used before items. For example:
//! A working comment applied to the module!
fn foo() {
//! Another working comment!
}
fn main() {}In case you want to document the item following the doc comment, you might want to use outer doc comment:
/// I am an outer doc comment
#[doc = "I am also an outer doc comment!"]
fn foo() {
// ...
}