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use infer::error_reporting::nice_region_error::NiceRegionError;
use infer::error_reporting::nice_region_error::util::AnonymousArgInfo;
use util::common::ErrorReported;
impl<'a, 'gcx, 'tcx> NiceRegionError<'a, 'gcx, 'tcx> {
pub(super) fn try_report_anon_anon_conflict(&self) -> Option<ErrorReported> {
let (span, sub, sup) = self.get_regions();
let anon_reg_sup = self.is_suitable_region(sup)?;
let anon_reg_sub = self.is_suitable_region(sub)?;
let scope_def_id_sup = anon_reg_sup.def_id;
let bregion_sup = anon_reg_sup.boundregion;
let scope_def_id_sub = anon_reg_sub.def_id;
let bregion_sub = anon_reg_sub.boundregion;
let ty_sup = self.find_anon_type(sup, &bregion_sup)?;
let ty_sub = self.find_anon_type(sub, &bregion_sub)?;
debug!(
"try_report_anon_anon_conflict: found_arg1={:?} sup={:?} br1={:?}",
ty_sub,
sup,
bregion_sup
);
debug!(
"try_report_anon_anon_conflict: found_arg2={:?} sub={:?} br2={:?}",
ty_sup,
sub,
bregion_sub
);
let (ty_sup, ty_fndecl_sup) = ty_sup;
let (ty_sub, ty_fndecl_sub) = ty_sub;
let AnonymousArgInfo {
arg: anon_arg_sup, ..
} = self.find_arg_with_region(sup, sup)?;
let AnonymousArgInfo {
arg: anon_arg_sub, ..
} = self.find_arg_with_region(sub, sub)?;
let sup_is_ret_type =
self.is_return_type_anon(scope_def_id_sup, bregion_sup, ty_fndecl_sup);
let sub_is_ret_type =
self.is_return_type_anon(scope_def_id_sub, bregion_sub, ty_fndecl_sub);
let span_label_var1 = if let Some(simple_name) = anon_arg_sup.pat.simple_name() {
format!(" from `{}`", simple_name)
} else {
format!("")
};
let span_label_var2 = if let Some(simple_name) = anon_arg_sub.pat.simple_name() {
format!(" into `{}`", simple_name)
} else {
format!("")
};
let (span_1, span_2, main_label, span_label) = match (sup_is_ret_type, sub_is_ret_type) {
(None, None) => {
let (main_label_1, span_label_1) = if ty_sup == ty_sub {
(
format!("this type is declared with multiple lifetimes..."),
format!(
"...but data{} flows{} here",
format!(" with one lifetime"),
format!(" into the other")
),
)
} else {
(
format!("these two types are declared with different lifetimes..."),
format!(
"...but data{} flows{} here",
span_label_var1,
span_label_var2
),
)
};
(ty_sup.span, ty_sub.span, main_label_1, span_label_1)
}
(Some(ret_span), _) => (
ty_sub.span,
ret_span,
format!(
"this parameter and the return type are declared \
with different lifetimes...",
),
format!("...but data{} is returned here", span_label_var1),
),
(_, Some(ret_span)) => (
ty_sup.span,
ret_span,
format!(
"this parameter and the return type are declared \
with different lifetimes...",
),
format!("...but data{} is returned here", span_label_var1),
),
};
struct_span_err!(self.tcx.sess, span, E0623, "lifetime mismatch")
.span_label(span_1, main_label)
.span_label(span_2, format!(""))
.span_label(span, span_label)
.emit();
return Some(ErrorReported);
}
}