impls | Rust macro to determine if a type implements | Code Quality library

It's a default generic type. It will be used unless you explicitly specify another in the concrete implementation. It's mentioned in the rust book:

When we use generic type parameters, we can specify a default concrete type for the generic type. This eliminates the need for implementors of the trait to specify a concrete type if the default type works. The syntax for specifying a default type for a generic type is when declaring the generic type.

In your build.gradle, try to update Kotlin to 1.5.10 and Compose to beta08.

Like this:

Update: androidx.compose.compiler:compiler:1.0.0-beta08 is released (June 2, 2021).

From this version, the expected version of Kotlin is 1.5.10.

Your struct requires a lifetime, which you have chosen to call ‘a’. That lifetime is then ‘given to’ or ‘shared with‘ self.children. Later, you implement your struct for the anonymous lifetime, which is the lifetime that the struct definition states self.children must also share. However, your ‘new‘ function implies creation of self.children with a ‘static‘ lifetime (and ‘static != ‘_ as ‘_ could be shorter than ‘static). Further your add child method requires a (plausibly) entirely separate lifetime which you also call ‘a’ (just because you called it ‘a’ does not make it the same as the ‘a’ you named in the struct definition). Try creating a new struct that takes a type rather than a lifetime (say T or V, for example)? If neither have bounds then they will be essentially equal. The same applies to lifetimes.

The actual solution lies in matching your lifetimes. Because of the self-referential nature of your struct you cannot use the anonymous lifetime, as the compiler needs to know that the lifetimes match when adding children. What is below now compiles. Note the use of Self to infer the lifetime <'a> upon creation. You could also have used Turtle<'a> but I personally would consider using Self easier, as it avoids the additional lifetime reference. Also, in order for your add_child method to work, the reference to "self" needs to be mutable (see &mut self). This is because you are modifying the contents of self.children and therefore mutating the struct.

Note that this will work for "any" lifetime, whether you have called it 'a or 'z or anything else. The point is that the compiler can infer that the lifetimes of everything involved are matching.

Since DerefMut inherit from Deref, you don't have to specify Target, pub trait DerefMut: Deref { use the Target define in Deref implementation.

Deref trait is very special, it can't really be use by "normal" user, almost only std can implement it for new type.

This is because it's borrow self and return a reference of "something else" problem is this something else can't be temporary, std use it control over rust ecosystem to be able to do that for example Vec implementation:

You can make $Add_or_Sub_Assign and $add_or_sub_assign into identifiers (:ident). That way they can be used as part of a type and method name respectively (the latter was never a type to begin with). You will need to follow what was mentioned in the comments and make += a single token instead of trying to split it.

The problem was that it couldn't find the replay archive specified. I supplied it with relative path, and during debugging it couldn't find it by relative path so I had to supply the absolute path.

After struggling with Apache Atlas for a while, I found 3.0.0 Snapshot version very buggy! Therefore I have decided to build and install Apache Atlas 2.1.0 RC3.

Prerequisite:

Make sure you have installed java on your machine. In case it is not installed on your computer, you can install it using the following command in Linux:

sudo apt-get install openjdk-8-jre

Then JAVA_HOME should be set:

This looks like a bug.

Thank you for reporting it to the Kotlin issue tracker. If anyone else encountered this bug, please let us know here: https://youtrack.jetbrains.com/issue/KT-45511. As soon as the ticket is resolved, I'll post an update on this answer.

EDIT: this is a comment from the ticket.

Adding Objective-C super types to a Kotlin object declaration is not supported at the moment. The compiler should, of course, clearly indicate that instead of crashing.
As a workaround, please declare PlatformSpecific as class.