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Display better error messages for E0282

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This commit is contained in:
Keith Yeung 2016-11-28 10:08:29 -08:00
parent 3d069e1b38
commit 9fcb6a2b88
1 changed files with 17 additions and 3 deletions
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20
src/librustc/traits/error_reporting.rs
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@ -827,12 +827,26 @@ impl<'a, 'gcx, 'tcx> InferCtxt<'a, 'gcx, 'tcx> {
fn need_type_info(&self, span: Span, ty: Ty<'tcx>) {
let ty = self.resolve_type_vars_if_possible(&ty);
let name = if let ty::TyInfer(ty::TyVar(ty_vid)) = ty.sty {
let ty_vars = self.type_variables.borrow();
if let TypeVariableOrigin::TypeParameterDefinition(_, name) =
*ty_vars.var_origin(ty_vid)
{
name.to_string()
} else {
ty.to_string()
}
} else {
ty.to_string()
};
let mut err = struct_span_err!(self.tcx.sess, span, E0282,
"unable to infer enough type information about `{}`",
ty);
name);
err.note("type annotations or generic parameter binding required");
err.span_label(span, &format!("cannot infer type for `{}`", ty));
err.emit()
err.span_label(span, &format!("cannot infer type for `{}`", name));
err.emit();
}
fn note_obligation_cause<T>(&self,