Stop querying for stack frames multiple times on CallerInfo()

assert/assertions.go

@@ -212,19 +212,23 @@ the problem actually occurred in calling code.*/
 func CallerInfo() []string {
 
 	var pc uintptr
-	var ok bool
 	var file string
 	var line int
 	var name string
 
 	callers := []string{}
-	for i := 0; ; i++ {
-		pc, file, line, ok = runtime.Caller(i)
-		if !ok {
-			// The breaks below failed to terminate the loop, and we ran off the
-			// end of the call stack.
-			break
-		}
+	pcs := []uintptr{}
+	n := runtime.Callers(0, pcs)
+	if n == 0 {
+		return []string{}
+	}
+	frames := runtime.CallersFrames(pcs[:n])
+
+	for {
+		frame, more := frames.Next()
+		pc = frame.PC
+		file = frame.File
+		line = frame.Line
 
 		// This is a huge edge case, but it will panic if this is the case, see #180
 		if file == "<autogenerated>" {
@@ -263,6 +267,10 @@ func CallerInfo() []string {
 			isTest(name, "Example") {
 			break
 		}
+
+		if !more {
+			break
+		}
 	}
 
 	return callers