use rustc_span::{BytePos, Span};

let source_map = cx.sess().source_map();

let snippet = source_map.span_to_snippet(err_span);

let sugg_span = if let Ok(snippet) = snippet {

// ( ( &IDENT ) )

// ~~~~ exclude these from the suggestion span to avoid unmatching parens

let exclude_n_bytes: u32 = snippet

.chars()

.take_while(|ch| ch.is_whitespace() || *ch == '(')

.map(|ch| ch.len_utf8() as u32)

.sum();

err_span.with_lo(err_span.lo() + BytePos(exclude_n_bytes)).with_hi(ex.span.lo())

} else {

err_span.with_hi(ex.span.lo())

};

emit_static_mut_refs(cx, err_span, sugg_span, m, !expr.span.from_expansion());

static mut TEST: usize = 0;

fn main() {

let _ = unsafe { (&TEST) as *const usize };

//~^WARN creating a shared reference to mutable static is discouraged

let _ = unsafe { ((&mut TEST)) as *const usize };

//~^WARN creating a mutable reference to mutable static is discouraged

warning: creating a shared reference to mutable static is discouraged

--> $DIR/static-mut-shared-parens.rs:8:22

|

LL | let _ = unsafe { (&TEST) as *const usize };

| ^^^^^^^ shared reference to mutable static

|

= note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/static-mut-references.html>

= note: shared references to mutable statics are dangerous; it's undefined behavior if the static is mutated or if a mutable reference is created for it while the shared reference lives

= note: `#[warn(static_mut_refs)]` on by default

help: use `&raw const` instead to create a raw pointer

|

LL | let _ = unsafe { (&raw const TEST) as *const usize };

| ~~~~~~~~~~

warning: creating a mutable reference to mutable static is discouraged

--> $DIR/static-mut-shared-parens.rs:11:22

|

LL | let _ = unsafe { ((&mut TEST)) as *const usize };

| ^^^^^^^^^^^^^ mutable reference to mutable static

|

= note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/static-mut-references.html>

= note: mutable references to mutable statics are dangerous; it's undefined behavior if any other pointer to the static is used or if any other reference is created for the static while the mutable reference lives

help: use `&raw mut` instead to create a raw pointer

|

LL | let _ = unsafe { ((&raw mut TEST)) as *const usize };

| ~~~~~~~~

warning: 2 warnings emitted