Prefer to use has_errors to err_count

src/librustc/session/mod.rs

@@ -320,8 +320,13 @@ impl Session {
         self.diagnostic().abort_if_errors();
     }
     pub fn compile_status(&self) -> Result<(), ErrorReported> {
-        compile_result_from_err_count(self.err_count())
+        if self.has_errors() {
+            Err(ErrorReported)
+        } else {
+            Ok(())
+        }
     }
+    // FIXME(matthewjasper) Remove this method, it should never be needed.
     pub fn track_errors<F, T>(&self, f: F) -> Result<T, ErrorReported>
     where
         F: FnOnce() -> T,
@@ -1388,11 +1393,3 @@ pub fn early_warn(output: config::ErrorOutputType, msg: &str) {
 }
 
 pub type CompileResult = Result<(), ErrorReported>;
-
-pub fn compile_result_from_err_count(err_count: usize) -> CompileResult {
-    if err_count == 0 {
-        Ok(())
-    } else {
-        Err(ErrorReported)
-    }
-}

src/librustc_errors/lib.rs

@@ -352,7 +352,7 @@ pub struct HandlerFlags {
 
 impl Drop for Handler {
     fn drop(&mut self) {
-        if self.err_count() == 0 {
+        if !self.has_errors() {
             let mut bugs = self.delayed_span_bugs.borrow_mut();
             let has_bugs = !bugs.is_empty();
             for bug in bugs.drain(..) {
@@ -705,10 +705,9 @@ impl Handler {
     }
 
     pub fn abort_if_errors(&self) {
-        if self.err_count() == 0 {
-            return;
+        if self.has_errors() {
+            FatalError.raise();
         }
-        FatalError.raise();
     }
     pub fn emit(&self, msp: &MultiSpan, msg: &str, lvl: Level) {
         if lvl == Warning && !self.flags.can_emit_warnings {

src/librustc_interface/passes.rs

@@ -959,7 +959,7 @@ fn analysis<'tcx>(tcx: TyCtxt<'tcx>, cnum: CrateNum) -> Result<()> {
     // lot of annoying errors in the compile-fail tests (basically,
     // lint warnings and so on -- kindck used to do this abort, but
     // kindck is gone now). -nmatsakis
-    if sess.err_count() > 0 {
+    if sess.has_errors() {
         return Err(ErrorReported);
     }
 

src/librustc_typeck/check/expr.rs

@@ -565,7 +565,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 // else an error would have been flagged by the
                 // `loops` pass for using break with an expression
                 // where you are not supposed to.
-                assert!(expr_opt.is_none() || self.tcx.sess.err_count() > 0);
+                assert!(expr_opt.is_none() || self.tcx.sess.has_errors());
             }
 
             ctxt.may_break = true;
@@ -577,10 +577,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             // this can only happen if the `break` was not
             // inside a loop at all, which is caught by the
             // loop-checking pass.
-            if self.tcx.sess.err_count() == 0 {
-                self.tcx.sess.delay_span_bug(expr.span,
-                    "break was outside loop, but no error was emitted");
-            }
+            self.tcx.sess.delay_span_bug(expr.span,
+                "break was outside loop, but no error was emitted");
 
             // We still need to assign a type to the inner expression to
             // prevent the ICE in #43162.

src/librustc_typeck/check/mod.rs

@@ -2129,8 +2129,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         &self.tcx.sess
     }
 
-    pub fn err_count_since_creation(&self) -> usize {
-        self.tcx.sess.err_count() - self.err_count_on_creation
+    pub fn errors_reported_since_creation(&self) -> bool {
+        self.tcx.sess.err_count() > self.err_count_on_creation
     }
 
     /// Produces warning on the given node, if the current point in the
@@ -4376,7 +4376,7 @@ pub fn check_bounds_are_used<'tcx>(tcx: TyCtxt<'tcx>, generics: &ty::Generics, t
         } else if let ty::Error = leaf_ty.sty {
             // If there is already another error, do not emit
             // an error for not using a type Parameter.
-            assert!(tcx.sess.err_count() > 0);
+            assert!(tcx.sess.has_errors());
             return;
         }
     }

src/librustc_typeck/check/regionck.rs

@@ -123,7 +123,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         // standalone expr (e.g., the `E` in a type like `[u32; E]`).
         rcx.outlives_environment.save_implied_bounds(id);
 
-        if self.err_count_since_creation() == 0 {
+        if !self.errors_reported_since_creation() {
             // regionck assumes typeck succeeded
             rcx.visit_body(body);
             rcx.visit_region_obligations(id);
@@ -173,7 +173,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             self.param_env,
         );
 
-        if self.err_count_since_creation() == 0 {
+        if !self.errors_reported_since_creation() {
             // regionck assumes typeck succeeded
             rcx.visit_fn_body(fn_id, body, self.tcx.hir().span(fn_id));
         }

src/librustdoc/core.rs

@@ -346,7 +346,7 @@ pub fn run_core(options: RustdocOptions) -> (clean::Crate, RenderInfo, RenderOpt
         // current architecture.
         let resolver = abort_on_err(compiler.expansion(), sess).peek().1.clone();
 
-        if sess.err_count() > 0 {
+        if sess.has_errors() {
             sess.fatal("Compilation failed, aborting rustdoc");
         }