Remove normalization of Span debug output in proc-macro tests
#75345
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Fixes rust-lang#74800 The definition of `is_x86_feature_detected!` (and similar macros) depends on the platform - it is produced by a `cfg_if!` invocation on x86, and a plain `#[cfg]` on other platforms. Since it is part of the prelude, we will end up importing different hygiene information depending on the platform. This previously required us to avoid printing raw `SyntaxContext` ids in any tests that uses the standard library, since the captured output will be platform-dependent. Previously, we replaced all `SyntaxContext` ids with "#CTXT", and the raw `Span` lo/hi bytes with "LO..HI". This commit adds `#![no_std]` and `extern crate std` to all proc-macro tests that print spans. This suppresses the prelude import, while still using lang items from `std` (which gives us a buildable binary). With this apporach, we will only load hygiene information for things which we explicitly import. This lets us re-add `-Z unpretty=expanded,hygiene`, since its output can now be made stable across all platforms. Additionally, we use `-Z span-debug` in more places, which lets us avoid the "LO..HI" normalization hack.
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Fixes #74800
The definition of
is_x86_feature_detected!(and similar macros)depends on the platform - it is produced by a
cfg_if!invocation onx86, and a plain
#[cfg]on other platforms. Since it is part of theprelude, we will end up importing different hygiene information
depending on the platform. This previously required us to avoid printing raw
SyntaxContextids in any tests that uses the standard library, sincethe captured output will be platform-dependent.
Previously, we replaced all
SyntaxContextids with "#CTXT", and theraw
Spanlo/hi bytes with "LO..HI".This commit adds
#![no_std]andextern crate stdto all proc-macrotests that print spans. This suppresses the prelude import, while
still using lang items from
std(which gives us a buildable binary).With this apporach, we will only load hygiene information for things
which we explicitly import. This lets us re-add
-Z unpretty=expanded,hygiene, since its output can now be made stableacross all platforms.
Additionally, we use
-Z span-debugin more places, which lets us avoidthe "LO..HI" normalization hack.