Use const_error_with_guaranteed more

3 files changed, 41 insertions, 9 deletions

diff --git a/compiler/rustc_mir_build/src/build/expr/as_constant.rs b/compiler/rustc_mir_build/src/build/expr/as_constant.rs
index 98df9c3f0e8..7d8a940bde5 100644
--- a/compiler/rustc_mir_build/src/build/expr/as_constant.rs
+++ b/compiler/rustc_mir_build/src/build/expr/as_constant.rs
@@ -9,6 +9,7 @@ use rustc_middle::mir::interpret::{
 use rustc_middle::mir::*;
 use rustc_middle::thir::*;
 use rustc_middle::ty::{self, CanonicalUserTypeAnnotation, TyCtxt};
+use rustc_span::DUMMY_SP;
 use rustc_target::abi::Size;
 
 impl<'a, 'tcx> Builder<'a, 'tcx> {
@@ -26,7 +27,9 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                 let literal =
                     match lit_to_mir_constant(tcx, LitToConstInput { lit: &lit.node, ty, neg }) {
                         Ok(c) => c,
-                        Err(LitToConstError::Reported) => ConstantKind::Ty(tcx.const_error(ty)),
+                        Err(LitToConstError::Reported(guar)) => {
+                            ConstantKind::Ty(tcx.const_error_with_guaranteed(ty, guar))
+                        }
                         Err(LitToConstError::TypeError) => {
                             bug!("encountered type error in `lit_to_mir_constant")
                         }
@@ -105,7 +108,15 @@ pub(crate) fn lit_to_mir_constant<'tcx>(
     let LitToConstInput { lit, ty, neg } = lit_input;
     let trunc = |n| {
         let param_ty = ty::ParamEnv::reveal_all().and(ty);
-        let width = tcx.layout_of(param_ty).map_err(|_| LitToConstError::Reported)?.size;
+        let width = tcx
+            .layout_of(param_ty)
+            .map_err(|_| {
+                LitToConstError::Reported(tcx.sess.delay_span_bug(
+                    DUMMY_SP,
+                    format!("couldn't compute width of literal: {:?}", lit_input.lit),
+                ))
+            })?
+            .size;
         trace!("trunc {} with size {} and shift {}", n, width.bits(), 128 - width.bits());
         let result = width.truncate(n);
         trace!("trunc result: {}", result);
@@ -136,12 +147,20 @@ pub(crate) fn lit_to_mir_constant<'tcx>(
         (ast::LitKind::Int(n, _), ty::Uint(_)) | (ast::LitKind::Int(n, _), ty::Int(_)) => {
             trunc(if neg { (*n as i128).overflowing_neg().0 as u128 } else { *n })?
         }
-        (ast::LitKind::Float(n, _), ty::Float(fty)) => {
-            parse_float_into_constval(*n, *fty, neg).ok_or(LitToConstError::Reported)?
-        }
+        (ast::LitKind::Float(n, _), ty::Float(fty)) => parse_float_into_constval(*n, *fty, neg)
+            .ok_or_else(|| {
+                LitToConstError::Reported(tcx.sess.delay_span_bug(
+                    DUMMY_SP,
+                    format!("couldn't parse float literal: {:?}", lit_input.lit),
+                ))
+            })?,
         (ast::LitKind::Bool(b), ty::Bool) => ConstValue::Scalar(Scalar::from_bool(*b)),
         (ast::LitKind::Char(c), ty::Char) => ConstValue::Scalar(Scalar::from_char(*c)),
-        (ast::LitKind::Err, _) => return Err(LitToConstError::Reported),
+        (ast::LitKind::Err, _) => {
+            return Err(LitToConstError::Reported(
+                tcx.sess.delay_span_bug(DUMMY_SP, "encountered LitKind::Err during mir build"),
+            ));
+        }
         _ => return Err(LitToConstError::TypeError),
     };
 
diff --git a/compiler/rustc_mir_build/src/thir/constant.rs b/compiler/rustc_mir_build/src/thir/constant.rs
index f626571b5b2..85e8801bda3 100644
--- a/compiler/rustc_mir_build/src/thir/constant.rs
+++ b/compiler/rustc_mir_build/src/thir/constant.rs
@@ -1,6 +1,7 @@
 use rustc_ast as ast;
 use rustc_middle::mir::interpret::{LitToConstError, LitToConstInput};
 use rustc_middle::ty::{self, ParamEnv, ScalarInt, TyCtxt};
+use rustc_span::DUMMY_SP;
 
 pub(crate) fn lit_to_const<'tcx>(
     tcx: TyCtxt<'tcx>,
@@ -10,7 +11,15 @@ pub(crate) fn lit_to_const<'tcx>(
 
     let trunc = |n| {
         let param_ty = ParamEnv::reveal_all().and(ty);
-        let width = tcx.layout_of(param_ty).map_err(|_| LitToConstError::Reported)?.size;
+        let width = tcx
+            .layout_of(param_ty)
+            .map_err(|_| {
+                LitToConstError::Reported(tcx.sess.delay_span_bug(
+                    DUMMY_SP,
+                    format!("couldn't compute width of literal: {:?}", lit_input.lit),
+                ))
+            })?
+            .size;
         trace!("trunc {} with size {} and shift {}", n, width.bits(), 128 - width.bits());
         let result = width.truncate(n);
         trace!("trunc result: {}", result);
@@ -44,7 +53,11 @@ pub(crate) fn lit_to_const<'tcx>(
         }
         (ast::LitKind::Bool(b), ty::Bool) => ty::ValTree::from_scalar_int((*b).into()),
         (ast::LitKind::Char(c), ty::Char) => ty::ValTree::from_scalar_int((*c).into()),
-        (ast::LitKind::Err, _) => return Err(LitToConstError::Reported),
+        (ast::LitKind::Err, _) => {
+            return Err(LitToConstError::Reported(
+                tcx.sess.delay_span_bug(DUMMY_SP, "encountered LitKind::Err during mir build"),
+            ));
+        }
         _ => return Err(LitToConstError::TypeError),
     };
 
diff --git a/compiler/rustc_mir_build/src/thir/pattern/mod.rs b/compiler/rustc_mir_build/src/thir/pattern/mod.rs
index 2526522a25c..776c748c7e5 100644
--- a/compiler/rustc_mir_build/src/thir/pattern/mod.rs
+++ b/compiler/rustc_mir_build/src/thir/pattern/mod.rs
@@ -614,7 +614,7 @@ impl<'a, 'tcx> PatCtxt<'a, 'tcx> {
             LitToConstInput { lit: &lit.node, ty: self.typeck_results.expr_ty(expr), neg };
         match self.tcx.at(expr.span).lit_to_mir_constant(lit_input) {
             Ok(constant) => self.const_to_pat(constant, expr.hir_id, lit.span, false).kind,
-            Err(LitToConstError::Reported) => PatKind::Wild,
+            Err(LitToConstError::Reported(_)) => PatKind::Wild,
             Err(LitToConstError::TypeError) => bug!("lower_lit: had type error"),
         }
     }