guix backtrace

substitute: updating list of substitutes from 'https://mirror.hydra.gnu.org'... 100.0%
Backtrace:
In srfi/srfi-1.scm:
   592:29 19 (map1 (("gawk" #<package gawk@4.1.4 gnu/packages/b…>) …))
   592:29 18 (map1 (("grep" #<package grep@3.0 gnu/packages/boo…>) …))
   592:29 17 (map1 (("coreutils" #<package coreutils@8.27 gnu/p…>) …))
   592:29 16 (map1 (("make" #<package make@4.2.1 gnu/packages/b…>) …))
   592:29 15 (map1 (("bash" #<package bash-minimal@4.4.12 gnu/p…>) …))
   592:29 14 (map1 (("ld-wrapper" #<package ld-wrapper@0 gnu/pa…>) …))
   592:29 13 (map1 (("binutils" #<package binutils@2.28 gnu/pac…>) …))
   592:29 12 (map1 (("gcc" #<package gcc@5.4.0 gnu/packages/com…>) …))
   592:29 11 (map1 (("libc" #<package glibc@2.25 gnu/packages/c…>) …))
   592:29 10 (map1 (("locales" #<package glibc-utf8-locales@2.2…>) …))
   592:29  9 (map1 (("guile" #<package guile@2.2.2 gnu/packages…>) …))
   592:17  8 (map1 (("libgit2" #<package libgit2@0.26.0 gnu/pac…>) …))
In guix/packages.scm:
   879:16  7 (expand-input #<build-daemon 256.97 1c18f00> #<package…> …)
   834:14  6 (cache! #<weak-table 456/883> #<package libgit2@0.26.0…> …)
In unknown file:
           5 (_ #<procedure thunk ()> #<procedure list _> #<undefined>)
In guix/packages.scm:
  1153:22  4 (thunk)
   834:14  3 (cache! #<weak-table 463/883> #<package libgit2@0.26.0…> …)
In unknown file:
           2 (_ #<procedure thunk ()> #<procedure list _> #<undefined>)
In guix/packages.scm:
   933:19  1 (thunk)
In guix/build-system/cmake.scm:
     63:2  0 (lower "libgit2-0.26.0" #:source _ #:inputs _ # _ # _ . #)

guix/build-system/cmake.scm:63:2: In procedure lower:
guix/build-system/cmake.scm:63:2: In procedure allocate-struct: Wrong type argument in position 1: #<procedure %bag?-procedure (obj)>