[stable2409] Backport #5632 #5634
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…5632) The macro hygiene for the `format_runtime_string!` macro was broken since #5010, which resulted in the following build error under certain circumstances: ```console error[E0433]: failed to resolve: use of undeclared crate or module `alloc` --> /home/clang/.cargo/registry/src/index.crates.io-6f17d22bba15001f/frame-benchmarking-36.0.0/src/v1.rs:1738:2 | 1738 | / sp_runtime::format_runtime_string!( 1739 | | "\n* Pallet: {}\n\ 1740 | | * Benchmark: {}\n\ 1741 | | * Components: {:?}\n\ ... | 1750 | | error_message, 1751 | | ) | |_____^ use of undeclared crate or module `alloc` | = note: this error originates in the macro `sp_runtime::format_runtime_string` (in Nightly builds, run with -Z macro-backtrace for more info) For more information about this error, try `rustc --explain E0433`. ``` This bug has been known already, but hasn't been fixed so far, see #5213 and https://substrate.stackexchange.com/questions/11786/use-of-undeclared-crate-or-module-alloc-when-upgrade-to-v1-13-0. I have made a mini rust crate that can reproduce the bug, and it also shows that this PR will fix the issue: https://github.com/clangenb/sp-runtime-string-test. (cherry picked from commit 96fecc3)
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gui1117
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Backport #5632 into
stable2409(cc @clangenb).