Make Diagnostic::span_fatal unconditionally raise an error

It had no callers which didn't immediately call `raise()`, and this
unifies the behavior with `Session`.

Author: jyn514

compiler/rustc_ast_lowering/src/expr.rs

@@ -1236,9 +1236,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
             (Some(..), Some(..), HalfOpen) => hir::LangItem::Range,
             (None, Some(..), Closed) => hir::LangItem::RangeToInclusive,
             (Some(..), Some(..), Closed) => unreachable!(),
-            (_, None, Closed) => {
-                self.diagnostic().span_fatal(span, "inclusive range with no end").raise()
-            }
+            (_, None, Closed) => self.diagnostic().span_fatal(span, "inclusive range with no end"),
         };
 
         let fields = self.arena.alloc_from_iter(

compiler/rustc_errors/src/lib.rs

@@ -634,19 +634,19 @@ impl Handler {
         DiagnosticBuilder::new(self, Level::Note, msg)
     }
 
-    pub fn span_fatal(&self, span: impl Into<MultiSpan>, msg: &str) -> FatalError {
+    pub fn span_fatal(&self, span: impl Into<MultiSpan>, msg: &str) -> ! {
         self.emit_diag_at_span(Diagnostic::new(Fatal, msg), span);
-        FatalError
+        FatalError.raise()
     }
 
     pub fn span_fatal_with_code(
         &self,
         span: impl Into<MultiSpan>,
         msg: &str,
         code: DiagnosticId,
-    ) -> FatalError {
+    ) -> ! {
         self.emit_diag_at_span(Diagnostic::new_with_code(Fatal, Some(code), msg), span);
-        FatalError
+        FatalError.raise()
     }
 
     pub fn span_err(&self, span: impl Into<MultiSpan>, msg: &str) {

compiler/rustc_parse/src/lexer/mod.rs

@@ -148,15 +148,11 @@ impl<'a> StringReader<'a> {
                         None => "unterminated block comment",
                     };
                     let last_bpos = self.pos;
-                    self.sess
-                        .span_diagnostic
-                        .struct_span_fatal_with_code(
-                            self.mk_sp(start, last_bpos),
-                            msg,
-                            error_code!(E0758),
-                        )
-                        .emit();
-                    FatalError.raise();
+                    self.sess.span_diagnostic.span_fatal_with_code(
+                        self.mk_sp(start, last_bpos),
+                        msg,
+                        error_code!(E0758),
+                    );
                 }
 
                 // Skip non-doc comments

compiler/rustc_session/src/cgu_reuse_tracker.rs

@@ -112,7 +112,7 @@ impl CguReuseTracker {
                                        not recorded",
                         cgu_user_name, cgu_name
                     );
-                    diag.span_fatal(error_span.0, &msg).raise();
+                    diag.span_fatal(error_span.0, &msg)
                 }
             }
         }

compiler/rustc_session/src/session.rs

@@ -421,15 +421,15 @@ impl Session {
     }
 
     pub fn span_fatal<S: Into<MultiSpan>>(&self, sp: S, msg: &str) -> ! {
-        self.diagnostic().span_fatal(sp, msg).raise()
+        self.diagnostic().span_fatal(sp, msg)
     }
     pub fn span_fatal_with_code<S: Into<MultiSpan>>(
         &self,
         sp: S,
         msg: &str,
         code: DiagnosticId,
     ) -> ! {
-        self.diagnostic().span_fatal_with_code(sp, msg, code).raise()
+        self.diagnostic().span_fatal_with_code(sp, msg, code)
     }
     pub fn fatal(&self, msg: &str) -> ! {
         self.diagnostic().fatal(msg).raise()