diff options
Diffstat (limited to 'src/pkg/text/template/exec.go')
| -rw-r--r-- | src/pkg/text/template/exec.go | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/pkg/text/template/exec.go b/src/pkg/text/template/exec.go index 43b0b266e..2f3231264 100644 --- a/src/pkg/text/template/exec.go +++ b/src/pkg/text/template/exec.go @@ -108,6 +108,10 @@ func errRecover(errp *error) { // ExecuteTemplate applies the template associated with t that has the given name // to the specified data object and writes the output to wr. +// If an error occurs executing the template or writing its output, +// execution stops, but partial results may already have been written to +// the output writer. +// A template may be executed safely in parallel. func (t *Template) ExecuteTemplate(wr io.Writer, name string, data interface{}) error { tmpl := t.tmpl[name] if tmpl == nil { @@ -118,6 +122,10 @@ func (t *Template) ExecuteTemplate(wr io.Writer, name string, data interface{}) // Execute applies a parsed template to the specified data object, // and writes the output to wr. +// If an error occurs executing the template or writing its output, +// execution stops, but partial results may already have been written to +// the output writer. +// A template may be executed safely in parallel. func (t *Template) Execute(wr io.Writer, data interface{}) (err error) { defer errRecover(&err) value := reflect.ValueOf(data) @@ -594,6 +602,9 @@ func (s *state) validateType(value reflect.Value, typ reflect.Type) reflect.Valu switch { case value.Kind() == reflect.Ptr && value.Type().Elem().AssignableTo(typ): value = value.Elem() + if !value.IsValid() { + s.errorf("dereference of nil pointer of type %s", typ) + } case reflect.PtrTo(value.Type()).AssignableTo(typ) && value.CanAddr(): value = value.Addr() default: |