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use crate::structured_errors::StructuredDiagnostic;
use rustc_errors::{Applicability, DiagnosticBuilder, DiagnosticId, ErrorGuaranteed};
use rustc_middle::ty::{Ty, TypeVisitableExt};
use rustc_session::Session;
use rustc_span::Span;
pub struct MissingCastForVariadicArg<'tcx, 's> {
pub sess: &'tcx Session,
pub span: Span,
pub ty: Ty<'tcx>,
pub cast_ty: &'s str,
}
impl<'tcx> StructuredDiagnostic<'tcx> for MissingCastForVariadicArg<'tcx, '_> {
fn session(&self) -> &Session {
self.sess
}
fn code(&self) -> DiagnosticId {
rustc_errors::error_code!(E0617)
}
fn diagnostic_common(&self) -> DiagnosticBuilder<'tcx, ErrorGuaranteed> {
let mut err = self.sess.struct_span_err_with_code(
self.span,
&format!("can't pass `{}` to variadic function", self.ty),
self.code(),
);
if self.ty.references_error() {
err.downgrade_to_delayed_bug();
}
if let Ok(snippet) = self.sess.source_map().span_to_snippet(self.span) {
err.span_suggestion(
self.span,
&format!("cast the value to `{}`", self.cast_ty),
format!("{} as {}", snippet, self.cast_ty),
Applicability::MachineApplicable,
);
} else {
err.help(&format!("cast the value to `{}`", self.cast_ty));
}
err
}
fn diagnostic_extended(
&self,
mut err: DiagnosticBuilder<'tcx, ErrorGuaranteed>,
) -> DiagnosticBuilder<'tcx, ErrorGuaranteed> {
err.note(&format!(
"certain types, like `{}`, must be casted before passing them to a \
variadic function, because of arcane ABI rules dictated by the C \
standard",
self.ty
));
err
}
}
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