Fails on nameless doctest snapshot with value

[GrandChaman]

What happened?

insta throws the following error:

thread 'main' panicked at 'Cannot determine reliable names for snapshot in doctests.  Please use explicit names instead.'

when providing the snapshot in code directly, which shouldn't require the snapshot to be named.

Reproduction steps

Either:

/// Some doc test
///
/// ```rust
///     let some_string = "Coucou je suis un joli bug";
///
///     insta::assert_display_snapshot!(some_string, @"Coucou je suis un joli bug");
/// ```
pub fn some_function() {}

or

/// Some doc test
///
/// ```rust
///     let some_string = "Coucou je suis un joli bug";
///
///     insta::assert_debug_snapshot!(some_string, @"Coucou je suis un joli bug");
/// ```
pub fn some_function() {}

Insta Version

1.17.0

rustc Version

rustc 1.62.1 (e092d0b6b 2022-07-16)

What did you expect?

When writing an assert_display_snapshot/assert_debug_snapshot with a provided snapshot in code, the name should be optional. It shouldn't be panicking.