diff options
Diffstat (limited to 'compiler/rustc_macros/src/diagnostics/utils.rs')
| -rw-r--r-- | compiler/rustc_macros/src/diagnostics/utils.rs | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/compiler/rustc_macros/src/diagnostics/utils.rs b/compiler/rustc_macros/src/diagnostics/utils.rs index c44ca7cc626..6791a9e35b8 100644 --- a/compiler/rustc_macros/src/diagnostics/utils.rs +++ b/compiler/rustc_macros/src/diagnostics/utils.rs @@ -102,6 +102,8 @@ pub(crate) struct FieldInfo<'a> { pub(crate) span: &'a proc_macro2::Span, } +/// Small helper trait for abstracting over `Option` fields that contain a value and a `Span` +/// for error reporting if they are set more than once. pub(crate) trait SetOnce<T> { fn set_once(&mut self, value: T); } @@ -122,6 +124,7 @@ impl<T> SetOnce<(T, Span)> for Option<(T, Span)> { } pub(crate) trait HasFieldMap { + /// Returns the binding for the field with the given name, if it exists on the type. fn get_field_binding(&self, field: &String) -> Option<&TokenStream>; /// In the strings in the attributes supplied to this macro, we want callers to be able to |