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Update E0392 to new error format #35671

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Aug 17, 2016
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Update E0392 to new error format #35671

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6 changes: 4 additions & 2 deletions src/librustc_typeck/check/wfcheck.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -653,8 +653,10 @@ fn error_380(ccx: &CrateCtxt, span: Span) {

fn error_392<'a, 'tcx>(ccx: &CrateCtxt<'a, 'tcx>, span: Span, param_name: ast::Name)
-> DiagnosticBuilder<'tcx> {
struct_span_err!(ccx.tcx.sess, span, E0392,
"parameter `{}` is never used", param_name)
let mut err = struct_span_err!(ccx.tcx.sess, span, E0392,
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@jonathandturner: Don't you prefer doing this without declaring variable?

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@canova canova Aug 15, 2016 •
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@GuillaumeGomez Actually I tried it first but code like this turns mutable reference of DiagnosticBuilder because of span_label but return value of function is DiagnosticBuilder(not reference) so I couldn't do like that:

struct_span_err!(ccx.tcx.sess, span, E0392,
                     "parameter `{}` is never used", param_name)
                     .span_label(span, &format!("unused type parameter"))

I don't know another way to do it without declaring variable so I did it like that. If there is a better way, I'm happy to do that.

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I thought the .emit() method would have done it. Have you tried it by any chance? Otherwise don't worry, it's just a detail.

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Tried it but didn't worked. Returned DiagnosticBuilder variable emitting in another function.

"parameter `{}` is never used", param_name);
err.span_label(span, &format!("unused type parameter"));
err
}

fn error_194(tcx: TyCtxt, span: Span, name: ast::Name) {
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1 change: 1 addition & 0 deletions src/test/compile-fail/E0392.rs
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Expand Up @@ -9,6 +9,7 @@
// except according to those terms.

enum Foo<T> { Bar } //~ ERROR E0392
//~| NOTE unused type parameter

fn main() {
}