I got it too for the first time yesterday on my 128G RAM and 32 CPU cores server:
--8<---------------cut here---------------start------------->8--- substitute: updating list of substitutes from [...] Updating from Git repository at 'https://git.savannah.gnu.org/git/guix.git'... Building from Git commit 3140844e33254316348135b03762eaeb04764544... substitute: updating list of substitutes from [...] The following derivation will be built: /gnu/store/7143x1dd2r5kch8dldyylz1ljhp3nird-guix-latest.drv copying and compiling to '/gnu/store/8a42yc4yxslrr1hf7wk5x5mddbs76yqm-guix-latest' with Guile 2.2.2... loading... 25.3% of 632 filesrandom seed for tests: 1506279202 loading... 99.8% of 632 files compiling... 94.8% of 632 filesice-9/threads.scm:289:22: In procedure loop: ice-9/threads.scm:289:22: Syntax error: guix/gexp.scm:530:8: return: return used outside of 'with-monad' in form (return output) Some deprecated features have been used. Set the environment variable GUILE_WARN_DEPRECATED to "detailed" and rerun the program to get more information. Set it to "no" to suppress this message. builder for `/gnu/store/7143x1dd2r5kch8dldyylz1ljhp3nird-guix-latest.drv' failed with exit code 1 guix pull: error: build failed: build of `/gnu/store/7143x1dd2r5kch8dldyylz1ljhp3nird-guix-latest.drv' failed --8<---------------cut here---------------end--------------->8--- And then, today, again: --8<---------------cut here---------------start------------->8--- substitute: updating list of substitutes from [...] Updating from Git repository at 'https://git.savannah.gnu.org/git/guix.git'... Building from Git commit 66660960ba75233ae5b6c539f43d97d06d64e9ad... substitute: updating list of substitutes from [...] The following derivation will be built: /gnu/store/dmv64icdan1fqrl00czgwx1an923fzda-guix-latest.drv copying and compiling to '/gnu/store/slqcrr5gwhi1zqv21wjp0l973zs3dywc-guix-latest' with Guile 2.2.2... loading... 25.3% of 632 filesrandom seed for tests: 1506327995 loading... 99.8% of 632 files compiling... 94.8% of 632 filesice-9/threads.scm:289:22: In procedure loop: ice-9/threads.scm:289:22: Syntax error: guix/gexp.scm:539:10: return: return used outside of 'with-monad' in form (return (derivation->output-path drv)) Some deprecated features have been used. Set the environment variable GUILE_WARN_DEPRECATED to "detailed" and rerun the program to get more information. Set it to "no" to suppress this message. builder for `/gnu/store/dmv64icdan1fqrl00czgwx1an923fzda-guix-latest.drv' failed with exit code 1 guix pull: error: build failed: build of `/gnu/store/dmv64icdan1fqrl00czgwx1an923fzda-guix-latest.drv' failed --8<---------------cut here---------------end--------------->8---
