diff --git a/compiler/rustc_errors/src/emitter.rs b/compiler/rustc_errors/src/emitter.rs
index 52c44231d8f0e..831d408195e2f 100644
--- a/compiler/rustc_errors/src/emitter.rs
+++ b/compiler/rustc_errors/src/emitter.rs
@@ -1657,6 +1657,31 @@ impl EmitterWriter {
let line_start = sm.lookup_char_pos(parts[0].span.lo()).line;
draw_col_separator_no_space(&mut buffer, 1, max_line_num_len + 1);
let mut lines = complete.lines();
+ if lines.clone().next().is_none() {
+ // Account for a suggestion to completely remove a line(s) with whitespace (#94192).
+ let line_end = sm.lookup_char_pos(parts[0].span.hi()).line;
+ for line in line_start..=line_end {
+ buffer.puts(
+ row_num - 1 + line - line_start,
+ 0,
+ &self.maybe_anonymized(line),
+ Style::LineNumber,
+ );
+ buffer.puts(
+ row_num - 1 + line - line_start,
+ max_line_num_len + 1,
+ "- ",
+ Style::Removal,
+ );
+ buffer.puts(
+ row_num - 1 + line - line_start,
+ max_line_num_len + 3,
+ &normalize_whitespace(&*file_lines.file.get_line(line - 1).unwrap()),
+ Style::Removal,
+ );
+ }
+ row_num += line_end - line_start;
+ }
for (line_pos, (line, highlight_parts)) in
lines.by_ref().zip(highlights).take(MAX_SUGGESTION_HIGHLIGHT_LINES).enumerate()
{
diff --git a/src/test/ui/suggestions/removal-of-multiline-trait-bound-in-where-clause.rs b/src/test/ui/suggestions/removal-of-multiline-trait-bound-in-where-clause.rs
new file mode 100644
index 0000000000000..56aed77c10e68
--- /dev/null
+++ b/src/test/ui/suggestions/removal-of-multiline-trait-bound-in-where-clause.rs
@@ -0,0 +1,30 @@
+struct Wrapper<T>(T);
+
+fn foo<T>(foo: Wrapper<T>)
+//~^ ERROR the size for values of type `T` cannot be known at compilation time
+where
+ T
+ :
+ ?
+ Sized
+{
+ //
+}
+
+fn bar<T>(foo: Wrapper<T>)
+//~^ ERROR the size for values of type `T` cannot be known at compilation time
+where T: ?Sized
+{
+ //
+}
+
+fn qux<T>(foo: Wrapper<T>)
+//~^ ERROR the size for values of type `T` cannot be known at compilation time
+where
+ T: ?Sized
+{
+ //
+}
+
+
+fn main() {}
diff --git a/src/test/ui/suggestions/removal-of-multiline-trait-bound-in-where-clause.stderr b/src/test/ui/suggestions/removal-of-multiline-trait-bound-in-where-clause.stderr
new file mode 100644
index 0000000000000..3df17056ef42c
--- /dev/null
+++ b/src/test/ui/suggestions/removal-of-multiline-trait-bound-in-where-clause.stderr
@@ -0,0 +1,83 @@
+error[E0277]: the size for values of type `T` cannot be known at compilation time
+ --> $DIR/removal-of-multiline-trait-bound-in-where-clause.rs:3:16
+ |
+LL | fn foo<T>(foo: Wrapper<T>)
+ | - ^^^^^^^^^^ doesn't have a size known at compile-time
+ | |
+ | this type parameter needs to be `std::marker::Sized`
+ |
+note: required by a bound in `Wrapper`
+ --> $DIR/removal-of-multiline-trait-bound-in-where-clause.rs:1:16
+ |
+LL | struct Wrapper<T>(T);
+ | ^ required by this bound in `Wrapper`
+help: you could relax the implicit `Sized` bound on `T` if it were used through indirection like `&T` or `Box<T>`
+ --> $DIR/removal-of-multiline-trait-bound-in-where-clause.rs:1:16
+ |
+LL | struct Wrapper<T>(T);
+ | ^ - ...if indirection were used here: `Box<T>`
+ | |
+ | this could be changed to `T: ?Sized`...
+help: consider removing the `?Sized` bound to make the type parameter `Sized`
+ |
+LL - where
+LL - T
+LL - :
+LL - ?
+LL - Sized
+ |
+
+error[E0277]: the size for values of type `T` cannot be known at compilation time
+ --> $DIR/removal-of-multiline-trait-bound-in-where-clause.rs:14:16
+ |
+LL | fn bar<T>(foo: Wrapper<T>)
+ | - ^^^^^^^^^^ doesn't have a size known at compile-time
+ | |
+ | this type parameter needs to be `std::marker::Sized`
+ |
+note: required by a bound in `Wrapper`
+ --> $DIR/removal-of-multiline-trait-bound-in-where-clause.rs:1:16
+ |
+LL | struct Wrapper<T>(T);
+ | ^ required by this bound in `Wrapper`
+help: you could relax the implicit `Sized` bound on `T` if it were used through indirection like `&T` or `Box<T>`
+ --> $DIR/removal-of-multiline-trait-bound-in-where-clause.rs:1:16
+ |
+LL | struct Wrapper<T>(T);
+ | ^ - ...if indirection were used here: `Box<T>`
+ | |
+ | this could be changed to `T: ?Sized`...
+help: consider removing the `?Sized` bound to make the type parameter `Sized`
+ |
+LL - where T: ?Sized
+ |
+
+error[E0277]: the size for values of type `T` cannot be known at compilation time
+ --> $DIR/removal-of-multiline-trait-bound-in-where-clause.rs:21:16
+ |
+LL | fn qux<T>(foo: Wrapper<T>)
+ | - ^^^^^^^^^^ doesn't have a size known at compile-time
+ | |
+ | this type parameter needs to be `std::marker::Sized`
+ |
+note: required by a bound in `Wrapper`
+ --> $DIR/removal-of-multiline-trait-bound-in-where-clause.rs:1:16
+ |
+LL | struct Wrapper<T>(T);
+ | ^ required by this bound in `Wrapper`
+help: you could relax the implicit `Sized` bound on `T` if it were used through indirection like `&T` or `Box<T>`
+ --> $DIR/removal-of-multiline-trait-bound-in-where-clause.rs:1:16
+ |
+LL | struct Wrapper<T>(T);
+ | ^ - ...if indirection were used here: `Box<T>`
+ | |
+ | this could be changed to `T: ?Sized`...
+help: consider removing the `?Sized` bound to make the type parameter `Sized`
+ |
+LL - where
+LL - T: ?Sized
+ |
+
+error: aborting due to 3 previous errors
+
+For more information about this error, try `rustc --explain E0277`.