fix: use fault.new location for formatting

.gitignore

@@ -0,0 +1 @@
+     .idea

.tools-version

@@ -0,0 +1 @@
+golang 1.18.4

flatten.go

@@ -51,6 +51,14 @@ func Flatten(err error) Chain {
 		case *container:
 			lastLocation = unwrapped.location
 
+		case *fundamental:
+			f = append([]Step{{
+				Location: unwrapped.location,
+				Message:  err.Error(),
+			}}, f...)
+
+			lastLocation = ""
+
 		default:
 			message := err.Error()
 

tests/flatten_test.go

@@ -39,7 +39,7 @@ func TestFlattenFaultSentinelError(t *testing.T) {
 
 	e0 := chain[0]
 	a.Equal("fault sentinel error", e0.Message)
-	a.Contains(e0.Location, "test_callers.go:29")
+	a.Contains(e0.Location, "root.go:15")
 
 	e1 := chain[1]
 	a.Equal("failed to call function", e1.Message)
@@ -77,7 +77,7 @@ func TestFlattenFaultInlineError(t *testing.T) {
 
 	e0 := chain[0]
 	a.Equal("fault root cause error", e0.Message)
-	a.Contains(e0.Location, "test_callers.go:29")
+	a.Contains(e0.Location, "root.go:28")
 
 	e1 := chain[1]
 	a.Equal("failed to call function", e1.Message)

tests/format_test.go

@@ -35,7 +35,7 @@ func TestFormatFaultSentinelError(t *testing.T) {
 	a.Equal("failed to call function: fault sentinel error", fmt.Sprintf("%s", err))
 	a.Equal("failed to call function: fault sentinel error", fmt.Sprintf("%v", err))
 	a.Regexp(`fault sentinel error
-\s+.+fault/tests/test_callers.go:29
+\s+.+fault/tests/root.go:15
 failed to call function
 \s+.+fault/tests/test_callers.go:20
 `, fmt.Sprintf("%+v", err))
@@ -65,7 +65,7 @@ func TestFormatFaultInlineError(t *testing.T) {
 	a.Equal("failed to call function: fault root cause error", fmt.Sprintf("%s", err))
 	a.Equal("failed to call function: fault root cause error", fmt.Sprintf("%v", err))
 	a.Regexp(`fault root cause error
-\s+.+fault/tests/test_callers.go:29
+\s+.+fault/tests/root.go:28
 failed to call function
 \s+.+fault/tests/test_callers.go:20
 `, fmt.Sprintf("%+v", err))