Re-implement #[derive(Queryable)]
using Macros 1.1
#458
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This was extracted from #453. Going forward Macros 1.1 is the intended
path of stabilization for procedural macros, so
diesel_codegen
willneed to be rewritten to use it.
Much of the helper code around this is a direct port of the libsyntax
version of our code, rewritten to use
syn
instead./cc @killercup @dtolnay I'm going to merge once CI is green, but if either of you want to take a quick look go for it. This is all straight up extracted from the other PR>