How do the quote (declarative) and proc_quote (procedural) macros allow interpolation of local variables?
Since (declarative) macros are hygienic, I would expect that they wouldn't be able to access the environment they're called in.
How does the `quote` macro achieve interpolation?
480 views Asked by DrunkCoder At
1
There are 1 answers
Related Questions in RUST
- `ColumnNotFound("id")` when inserting with SQLx
- Polars with Rust: Out of Memory Error when Processing Large Dataset in Docker Using Streaming
- Why is a slice a DST?
- Unable to Retrieve External Public Address in libp2p Swarm Events
- Dynamic Nested Multi-Dimensional Arrays in Rust
- Generic property compare
- "(Reason: CORS header ‘Access-Control-Allow-Origin’ missing)" while trying to access Actix webserver from Wix site
- Is a directory (os error 21) when using rust to move a file
- Different types even though same value assigned
- How to pass a byte array to a WASM module from wasmer in Rust?
- Mutable borrow problem with inserting Vacant entry into HashMap
- Expected behavior while printing reference and dereference of a variable
- How to allocate a large structure in a heap baked `Arc<T>` without stack overflow in Rust?
- In Rust, how to inspect values captured by a closure?
- How to encrypt a string at compile-time and decrypt it at runtime in Rust, similar to constexpr encryption in c++?
Related Questions in SCOPE
- Why will this code compile although it defines two variables with the same name?
- Preserving DataFrame Modifications Across Options in a Streamlit Application
- Call Databricks API from an ASP.NET Core web application
- How are reference to objects handled in javascript when returning object and modifying them in their original functions
- Why do different delivery methods have different results when applying PHP's global keyword?
- Why is my function overwriting global variable values that are passed to it?
- Lua imported global and local variables with the same name
- I'm having trouble trying to export the data from an object in Flutter using get_it
- Members of struct lose value when created by factory method
- JavaScript function not updating value after a while loop
- Local vs NonLocal Scope Python
- How do I determine scope in an XMLHttp callback function
- Module script-scoped variables not accessable in module function's ArgumentCompleter block
- UnboundLocalError: cannot access local variable 'currentPlayer' where it is not associated with a value
- Calling Fire-And-Forget Methods - Which Scope?
Related Questions in MACROS
- drop down list to decide which range my graph will plot
- Catia V5 Dynamic Hidden Line Removal With Macro Please Help Me
- Convert macro to a function but cannot concatenate inputs using std::stringstream
- Common Lisp: How to use a macro within a macro?
- How to remove the "*" in c++ macro args?
- Caused by : java. awt. HeadlessException
- When I click "enable macros" on my PowerPoint presentation, I get an error saying controls can't be activated. They're not registered on this computer
- SAS Macro Variables
- Generate unique type parameter in procedural derive macro
- unexpected interaction between macroexpand-1 and macrolet
- Can C macros be expanded in flex?
- External macro definition in header
- How to undefine and redefine a macro in C++?
- How to check if a macro argument is an integer literal in C
- How come clang and gcc don't produce a cast warning for this openssl macro, but do otherwise?
Related Questions in HYGIENE
- Macro that accepts an expression referencing variables defined by the macro
- Scheme: local macro (let-syntax) inside global macro (define-syntax)
- Getting error while running mvn clean install in hygieia/API
- Elixir var! ... How to read a variable from caller's scope
- Racket - How to define a function that can be used both in syntax transformers and ordinary code?
- How to debug Julia macros?
- How does the `quote` macro achieve interpolation?
- How to create Alist from List using syntax-rules in Scheme?
- Hygienic out-of-tree builds in Gitlab CI
- Use local bindings at call site in Rust "macro_rules" macros
- How to insert literal identifier from input pattern as symbol in syntax-rules macro
- How to turn off macro hygiene?
- How to use a proc macro to create a macro that can violate hygiene?
- How can I extract hygiene ratings from Zomato?
- Passing macro variable to function for interpolation
Popular Questions
- How do I undo the most recent local commits in Git?
- How can I remove a specific item from an array in JavaScript?
- How do I delete a Git branch locally and remotely?
- Find all files containing a specific text (string) on Linux?
- How do I revert a Git repository to a previous commit?
- How do I create an HTML button that acts like a link?
- How do I check out a remote Git branch?
- How do I force "git pull" to overwrite local files?
- How do I list all files of a directory?
- How to check whether a string contains a substring in JavaScript?
- How do I redirect to another webpage?
- How can I iterate over rows in a Pandas DataFrame?
- How do I convert a String to an int in Java?
- Does Python have a string 'contains' substring method?
- How do I check if a string contains a specific word?
Popular Tags
Trending Questions
- UIImageView Frame Doesn't Reflect Constraints
- Is it possible to use adb commands to click on a view by finding its ID?
- How to create a new web character symbol recognizable by html/javascript?
- Why isn't my CSS3 animation smooth in Google Chrome (but very smooth on other browsers)?
- Heap Gives Page Fault
- Connect ffmpeg to Visual Studio 2008
- Both Object- and ValueAnimator jumps when Duration is set above API LvL 24
- How to avoid default initialization of objects in std::vector?
- second argument of the command line arguments in a format other than char** argv or char* argv[]
- How to improve efficiency of algorithm which generates next lexicographic permutation?
- Navigating to the another actvity app getting crash in android
- How to read the particular message format in android and store in sqlite database?
- Resetting inventory status after order is cancelled
- Efficiently compute powers of X in SSE/AVX
- Insert into an external database using ajax and php : POST 500 (Internal Server Error)
Why though?
works fine.
Macros being hygienic doesn't mean they can't access the environment they're called in (that would make them completely useless), it means they don't accidentally affect the environment they're called in, that is, the internal symbols of the macro will neither leak into nor conflict with environment symbols.
For instance using C macros, the names inside and outside of the macro live in the exact same namespace, so it's possible to have collisions and odd side-effects.