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This option was used to gate f16 and f128 when support across backends and targets was inconsistent. We now have the rustc builtin cfg target_has_reliable{f16,f128} which has taken over this usecase. Remove no-f16-f128 since it is now unused and redundant.

r? @Amanieu

This option was used to gate `f16` and `f128` when support across
backends and targets was inconsistent. We now have the rustc builtin cfg
`target_has_reliable{f16,f128}` which has taken over this usecase.
Remove no-f16-f128 since it is now unused and redundant.
@rustbot rustbot added A-compiler-builtins Area: compiler-builtins (https://github.com/rust-lang/compiler-builtins) S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Jan 11, 2026
@JayanAXHF JayanAXHF added the F-f16_and_f128 `#![feature(f16)]`, `#![feature(f128)]` label Jan 12, 2026
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A-compiler-builtins Area: compiler-builtins (https://github.com/rust-lang/compiler-builtins) F-f16_and_f128 `#![feature(f16)]`, `#![feature(f128)]` S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue.

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