prefer `T::IS_ZST` over manual check#155840

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Lars-Schumann wants to merge 3 commits intorust-lang:mainfrom

Lars-Schumann:prefer-is-zst

Commits on Apr 26, 2026

prefer T::IS_ZST over manual check
Lars-Schumann
committed

Commits on Apr 27, 2026

replace manual is_zst checks in compiler-builtins and proc_macro
Lars-Schumann
committed
replace manual is_zst checks in rustc_middle and rustc_arena
Lars-Schumann
committed