diff --git a/src/parse/parser.rs b/src/parse/parser.rs
index 7adf339b453..6051241309d 100644
--- a/src/parse/parser.rs
+++ b/src/parse/parser.rs
@@ -5,7 +5,7 @@
 use rustc_ast::{ast, attr, ptr};
 use rustc_errors::Diag;
 use rustc_parse::parser::Parser as RawParser;
-use rustc_parse::{new_parser_from_file, unwrap_or_emit_fatal};
+use rustc_parse::{new_parser_from_file, new_parser_from_source_str, unwrap_or_emit_fatal};
 use rustc_span::{sym, Span};
 use thin_vec::ThinVec;
 
@@ -51,12 +51,9 @@ pub(crate) fn build(self) -> Result<Parser<'a>, ParserError> {
 
         let parser = match Self::parser(psess.inner(), input) {
             Ok(p) => p,
-            Err(db) => {
-                if let Some(diagnostics) = db {
-                    psess.emit_diagnostics(diagnostics);
-                    return Err(ParserError::ParserCreationError);
-                }
-                return Err(ParserError::ParsePanicError);
+            Err(diagnostics) => {
+                psess.emit_diagnostics(diagnostics);
+                return Err(ParserError::ParserCreationError);
             }
         };
 
@@ -66,18 +63,14 @@ pub(crate) fn build(self) -> Result<Parser<'a>, ParserError> {
     fn parser(
         psess: &'a rustc_session::parse::ParseSess,
         input: Input,
-    ) -> Result<rustc_parse::parser::Parser<'a>, Option<Vec<Diag<'a>>>> {
+    ) -> Result<RawParser<'a>, Vec<Diag<'a>>> {
         match input {
-            Input::File(ref file) => catch_unwind(AssertUnwindSafe(move || {
-                unwrap_or_emit_fatal(new_parser_from_file(psess, file, None))
-            }))
-            .map_err(|_| None),
-            Input::Text(text) => rustc_parse::new_parser_from_source_str(
+            Input::File(ref file) => new_parser_from_file(psess, file, None),
+            Input::Text(text) => new_parser_from_source_str(
                 psess,
                 rustc_span::FileName::Custom("stdin".to_owned()),
                 text,
-            )
-            .map_err(Some),
+            ),
         }
     }
 }