Flowistry is a tool that analyzes the information flow of Rust programs. Flowistry understands whether it's possible for one piece of code to affect another. Flowistry integrates into the IDE to provide a "focus mode" which helps you focus on the code that's related to your current task.
For example, this GIF shows the focus mode when reading a function that unions two sets together:
When the user clicks a given variable or expression, Flowistry fades out all code that does not influence that code, and is not influenced by that code. For example, orig_len is not influenced by the for-loop, while set.len() is.
Flowistry can be helpful when you're reading a function with a lot of code. For example, this GIF shows a real function in the Rust compiler. If you want to understand the role of a specific argument to the function, then Flowistry can filter out most of the code as irrelevant:
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