typeck: check casts from pointers to floats, closes #15445 #15559
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I've added an error message for casts from raw pointers to floats #15445.
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Implement builtin#format_args, using rustc's format_args parser `format_args!` now expands to `builtin#format_args(template, args...)`, the actual expansion now instead happens in lowering where we desugar this expression by using lang paths. As a bonus, we no longer need to evaluate `format_args` as an eager macro which means less macro expansions overall -> less cache thrashing! Fixes rust-lang/rust-analyzer#15082
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I've added an error message for casts from raw pointers to floats #15445.