diff options
| -rw-r--r-- | src/libcore/any.rs | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/libcore/any.rs b/src/libcore/any.rs index 7935c9b1b39..c5dcdfed12a 100644 --- a/src/libcore/any.rs +++ b/src/libcore/any.rs @@ -476,11 +476,15 @@ pub const fn type_name<T: ?Sized>() -> &'static str { /// /// This is intended for diagnostic use. The exact contents and format of the /// string are not specified, other than being a best-effort description of the -/// type. For example, `type_name_of::<Option<String>>(None)` could return +/// type. For example, `type_name_of_val::<Option<String>>(None)` could return /// `"Option<String>"` or `"std::option::Option<std::string::String>"`, but not /// `"foobar"`. In addition, the output may change between versions of the /// compiler. /// +/// This function does not resolve trait objects, +/// meaning that `type_name_of_val(&7u32 as &dyn Debug)` +/// may return `"dyn Debug"`, but not `"u32"`. +/// /// The type name should not be considered a unique identifier of a type; /// multiple types may share the same type name. /// |