RFC: Quick dbg!(expr) macro#2173

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Centril wants to merge 30 commits intorust-lang:masterfrom

Centril:rfc/quick-debug-macro

Commits on Oct 16, 2017

rfc: quick_debug_macro, updated RFC with labels and multiple expressions according to https://github.com/rust-lang/rfcs/pull/2173#issuecomment-336752562
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Commits on Oct 18, 2017

rfc, quick_debug_macro: fixed language wrt. while/without hurting perf
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rfc, quick_debug_macro: inserted manual word-wrap for readability
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rfc, quick_debug_macro: exact impl now uses BufWriter + stderr().lock()
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rfc, quick_debug_macro: readded column!() to currently unresolved + pro/cons for it
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rfc, quick_debug_macro: moved macro name bikeshed to # rationale & alternatives
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rfc, quick_debug_macro: added How do we teach this? section on pedagogy of teaching Rust with the macro
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rfc, quick_debug_macro: note on qdbg!
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rfc, quick_debug_macro: trailing newline => unresolved questions.
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rfc, quick_debug_macro: optimized macro for release builds wrt. compile time.
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rfc, quick_debug_macro, ref-level-impl: notes on why macro is identity on release builds
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rfc, quick_debug_macro: fixed mistake in prev commit + fixed link in HDWTT
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rfc, quick_debug_macro: expanded on dbg! as identity in motivation
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rfc, quick_debug_macro: enforce label is string literal + note on shorter format for literals
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Commits on Oct 19, 2017

Commits on Oct 23, 2017

rfc, quick_debug_macro: more Q & A + minor formatting fixes
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Commits on Oct 24, 2017

rfc, quick_debug_macro: added notes on panic!()s
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Commits on Oct 26, 2017

rfc, quick_debug_macro: improved formatting + notes on specialization
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Commits on Oct 27, 2017

rfc, quick_debug_macro: simplified macro slightly, no semantic changes
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Commits on Jan 19, 2018

Commits on Jan 29, 2018

rfc, quick_debug_macro: fixed typo; thanks @xftroxgpx
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