proc: fix next when current function is unknown on macOS

Updates #893

pkg/proc/proc.go

@@ -80,12 +80,8 @@ func Next(dbp Process) (err error) {
 	}
 
 	if err = next(dbp, false); err != nil {
-		switch err.(type) {
+		dbp.ClearInternalBreakpoints()
-		case ThreadBlockedError, NoReturnAddr: // Noop
+		return
-		default:
-			dbp.ClearInternalBreakpoints()
-			return
-		}
 	}
 
 	return Continue(dbp)

pkg/proc/proc_test.go

@@ -2969,6 +2969,9 @@ func TestIssue893(t *testing.T) {
 		if _, ok := err.(*frame.NoFDEForPCError); ok {
 			return
 		}
+		if _, ok := err.(proc.ThreadBlockedError); ok {
+			return
+		}
 		assertNoError(err, t, "Next")
 	})
 }

pkg/proc/threads.go

@@ -4,7 +4,6 @@ import (
 	"debug/gosym"
 	"encoding/binary"
 	"errors"
-	"fmt"
 	"go/ast"
 	"go/token"
 	"path/filepath"
@@ -129,12 +128,6 @@ func next(dbp Process, stepInto bool) error {
 		return err
 	}
 
-	for i := range text {
-		if text[i].Inst == nil {
-			fmt.Printf("error at instruction %d\n", i)
-		}
-	}
-
 	sameGCond := SameGoroutineCondition(selg)
 	retFrameCond := andFrameoffCondition(sameGCond, retframe.CFA-int64(retframe.StackHi))
 	sameFrameCond := andFrameoffCondition(sameGCond, topframe.CFA-int64(topframe.StackHi))