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I'm rewriting a Rust function transform function from `&mut Foo` to `Foo -> Foo`. It might be a little slower, but ownership makes it harder to miss parts of the Foo type when I work with values.
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C# has an interesting concept of second-class macros called Source Generators: https://devblogs.microsoft.com/dotnet/introducing-c-source-generators/
You can generate additional code at build time, but you can't transform existing expressions (unlike normal macros), so it's more amenable to tooling.
Do compilers ever transform pairs of malloc/free? E.g. in a loop:
p = malloc(32);
foo(p);
free(p);
In principle this doesn't need to be allocated on the heap.
It's amazing that merging work at all.
It's a dumb textual transform that provides no guarantees that the code is even syntactically valid, let alone correct. The problem feels AI-complete.
I've seen bad resolutions of merge conflicts way more than bad automatic merges though.