1 files changed, 15 insertions, 2 deletions
diff --git a/compiler/rustc_mir_build/src/build/custom/mod.rs b/compiler/rustc_mir_build/src/build/custom/mod.rs
index 3de2f45ad..ead20539e 100644
--- a/compiler/rustc_mir_build/src/build/custom/mod.rs
+++ b/compiler/rustc_mir_build/src/build/custom/mod.rs
@@ -88,11 +88,11 @@ pub(super) fn build_custom_mir<'tcx>(
     };
 
     let res: PResult<_> = try {
-        pctxt.parse_args(&params)?;
+        pctxt.parse_args(params)?;
         pctxt.parse_body(expr)?;
     };
     if let Err(err) = res {
-        tcx.sess.diagnostic().span_fatal(
+        tcx.sess.dcx().span_fatal(
             err.span,
             format!("Could not parse {}, found: {:?}", err.expected, err.item_description),
         )
@@ -162,6 +162,19 @@ impl<'tcx, 'body> ParseCtxt<'tcx, 'body> {
             expected: expected.to_string(),
         }
     }
+
+    fn stmt_error(&self, stmt: StmtId, expected: &'static str) -> ParseError {
+        let stmt = &self.thir[stmt];
+        let span = match stmt.kind {
+            StmtKind::Expr { expr, .. } => self.thir[expr].span,
+            StmtKind::Let { span, .. } => span,
+        };
+        ParseError {
+            span,
+            item_description: format!("{:?}", stmt.kind),
+            expected: expected.to_string(),
+        }
+    }
 }
 
 type PResult<T> = Result<T, ParseError>;