Change:
I accidentally typoed an underscore instead of a space between and the name of the new variable I was trying to declare. If a binding isn't found, and it starts with (or frankly , if you forget/miss the space completely), it seems like it would be more likely to suggest ( plus a space) rather than the current suggestion of an additional . No response <!-- TRIAGEBOTSTART --<!-- TRIAGEBOTASSIGNSTART --<!-- TRIAGEBOTASSIGNDATASTARTTRIAGEBOTASSIGNDATAEND --<!-- TRIAGEBOTASSIGNEND --<!-- TRIAGEBOTEND --
interesting, I'd like to have a try. but might not solve it quicklly casuze I am new to rustc
sounds good! feel free to ask for help if you need it, but the implementation should be fairly simple. assign

Discussion:
fn let_binding_suggestion(&mut self, err: &mut Diagnostic, ident_span: Span) -> bool { if let Some(Expr { kind: ExprKind::Assign(lhs, ..), .. }) = self.diagnostic_metadata.in_assignment <del> && let ast::ExprKind::Path(None, _) = lhs.kind </del> <ins> && let ast::ExprKind::Path(None, ref path) = lhs.kind </ins> { if !ident_span.from_expansion() { <ins> let (span, text) = match path.segments.first() { Some(seg) if let Some(name) = seg.ident.as_str().strip_prefix("let") => { // a special case for #117894 let name = name.strip_prefix("_").unwrap_or(name); (ident_span, format!("let {name}")) } _ => (ident_span.shrink_to_lo(), "let ".to_string()), }; </ins> err.span_suggestion_verbose( <del> ident_span.shrink_to_lo(), </del> <ins> span, </ins> "you might have meant to introduce a new binding", <del> "let ".to_string(), </del> <ins> text, </ins> Applicability::MaybeIncorrect, ); return true;

let x = "x"; //~ ERROR cannot find value `x` in this scope println!("x: {}", x); //~ ERROR cannot find value `x` in this scope <ins> let some_variable = 6; //~ cannot find value `let_some_variable` in this scope println!("some_variable: {}", some_variable); //~ ERROR cannot find value `some_variable` in this scope let other_variable = 6; //~ cannot find value `letother_variable` in this scope println!("other_variable: {}", other_variable); //~ ERROR cannot find value `other_variable` in this scope </ins> if x == "x" { //~^ ERROR cannot find value `x` in this scope println!("x is 1");

x = "x"; //~ ERROR cannot find value `x` in this scope println!("x: {}", x); //~ ERROR cannot find value `x` in this scope <ins> let_some_variable = 6; //~ cannot find value `let_some_variable` in this scope println!("some_variable: {}", some_variable); //~ ERROR cannot find value `some_variable` in this scope letother_variable = 6; //~ cannot find value `letother_variable` in this scope println!("other_variable: {}", other_variable); //~ ERROR cannot find value `other_variable` in this scope </ins> if x == "x" { //~^ ERROR cannot find value `x` in this scope println!("x is 1");

LL |     println!("x: {}", x); |                       ^ not found in this scope <ins> error[E0425]: cannot find value `let_some_variable` in this scope --> $DIR/suggest-let-for-assignment.rs:10:5 | LL |     let_some_variable = 6; |     ^^^^^^^^^^^^^^^^^ | help: you might have meant to introduce a new binding | LL |     let some_variable = 6; |     ~~~~~~~~~~~~~~~~~ error[E0425]: cannot find value `some_variable` in this scope --> $DIR/suggest-let-for-assignment.rs:11:35 | LL |     println!("some_variable: {}", some_variable); |                                   ^^^^^^^^^^^^^ not found in this scope error[E0425]: cannot find value `letother_variable` in this scope --> $DIR/suggest-let-for-assignment.rs:13:5 | LL |     letother_variable = 6; |     ^^^^^^^^^^^^^^^^^ | help: you might have meant to introduce a new binding | LL |     let other_variable = 6; |     ~~~~~~~~~~~~~~~~~~ error[E0425]: cannot find value `other_variable` in this scope --> $DIR/suggest-let-for-assignment.rs:14:36 | LL |     println!("other_variable: {}", other_variable); |                                    ^^^^^^^^^^^^^^ not found in this scope </ins> error[E0425]: cannot find value `x` in this scope <del> --> $DIR/suggest-let-for-assignment.rs:10:8 </del> <ins> --> $DIR/suggest-let-for-assignment.rs:16:8 </ins> | LL |     if x == "x" { |        ^ not found in this scope error[E0425]: cannot find value `y` in this scope <del> --> $DIR/suggest-let-for-assignment.rs:15:5 </del> <ins> --> $DIR/suggest-let-for-assignment.rs:21:5 </ins> | LL |     y = 1 + 2; |     ^

|     +++ error[E0425]: cannot find value `y` in this scope <del> --> $DIR/suggest-let-for-assignment.rs:16:23 </del> <ins> --> $DIR/suggest-let-for-assignment.rs:22:23 </ins> | LL |     println!("y: {}", y); |                       ^ not found in this scope <del> error: aborting due to 7 previous errors </del> <ins> error: aborting due to 11 previous errors </ins> For more information about this error, try `rustc --explain E0425`.