I also get a build error for pypy-7.3.5, but mine is slightly different:
---
starting phase `install'
error: in phase 'install': uncaught exception:
unbound-variable #f "Unbound variable: ~S" (out) #f
phase `install' failed after 0.1 seconds
Backtrace:
10 (primitive-load "/gnu/store/rlmxdywralyifcjlyq3ljw87mjj…")
In guix/build/gnu-build-system.scm:
906:2 9 (gnu-build #:source _ #:outputs _ #:inputs _ #:phases . #)
In ice-9/boot-9.scm:
1752:10 8 (with-exception-handler _ _ #:unwind? _ # _)
In srfi/srfi-1.scm:
634:9 7 (for-each #<procedure 7fffeeacb9c0 at guix/build/gnu-b…> …)
In ice-9/boot-9.scm:
1752:10 6 (with-exception-handler _ _ #:unwind? _ # _)
In guix/build/gnu-build-system.scm:
927:23 5 (_)
In ice-9/eval.scm:
159:9 4 (_ #(#(#(#(#(#(#<directory (guile-user)…>) …) …) …) …) …))
223:20 3 (proc #(#(#(#(#(#(#<directory (guile-us…>) …) …) …) …) …))
In unknown file:
2 (%resolve-variable (7 . out) #<directory (guile-user) 7…>)
In ice-9/boot-9.scm:
1685:16 1 (raise-exception _ #:continuable? _)
1685:16 0 (raise-exception _ #:continuable? _)
ice-9/boot-9.scm:1685:16: In procedure raise-exception:
Unbound variable: out
---
The file it's loading is:
/gnu/store/rlmxdywralyifcjlyq3ljw87mjjnbarj-pypy-7.3.5-builder
which only contains `out` as a bare symbol in the expression:
(copy-recursively dist-dir out)
I believe this line is expanded from gnu/packages/python.scm#868:
(copy-recursively dist-dir #$output)
though I don't know gexps well enough to figure out anything past that.
I hope this helps,
-shcv
