bug#45131: guild fails to compile a Tree-IL file

["Tommi Höynälänmaa" <tommi.hoynalanmaa@gmail.com>]

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This bug occurs in both guile version 3.0.4.38-64c894 and 
3.0.4-1.2ubuntu3. I use Ubuntu 20.10.

*** Steps to reproduce ***

1. Create file hello1.scm with the following contents:

---cut here---

(display "Hello world")
(newline)

---cut here---

2. Give command

guild compile --to=tree-il -o hello1.tree-il hello1.scm

3. Give command

guild compile --from=tree-il -o hello1.go hello1.tree-il

*** Expected output ***

File hello1.tree-il should be compiled to hello1.go

*** Actual output ***

---cut here---

Backtrace:
In /home/tohoyn/git/other/guile/meta/guild:
     72:17 19 (main _)
In srfi/srfi-1.scm:
     634:9 18 (for-each #<procedure 7fa5b08eb6e0 at scripts/compile.…> …)
In scripts/compile.scm:
    279:26 17 (_ _)
In system/base/target.scm:
      65:6 16 (with-target _ _)
In system/base/compile.scm:
     187:6 15 (compile-file "hello1.tree-il" #:output-file _ #:from _ …)
      53:4 14 (call-with-output-file/atomic _ _ _)
In ice-9/boot-9.scm:
   1736:10 13 (with-exception-handler _ _ #:unwind? _ # _)
In system/base/compile.scm:
     69:11 12 (_)
    190:11 11 (_ #<closed: file 7fa5af3990e0>)
    335:18 10 (read-and-compile #<input: hello1.tree-il 13> #:from _ # …)
      84:6  9 (compute-compiler _ #f 2 1 (#:to-file? #t #:warnings #))
In system/base/language.scm:
     63:11  8 (lookup-language #f)
In ice-9/threads.scm:
     390:8  7 (_ _)
In ice-9/boot-9.scm:
   3223:13  6 (_)
   3493:26  5 (try-module-autoload _ _)
    222:29  4 (map1 (language #f))
    222:17  3 (map1 (#f))
   3494:48  2 (_ _)
In unknown file:
            1 (symbol->string #f)
In ice-9/boot-9.scm:
   1669:16  0 (raise-exception _ #:continuable? _)

ice-9/boot-9.scm:1669:16: In procedure raise-exception:
In procedure symbol->string: Wrong type argument in position 1 
(expecting symbol): #f
---cut here---

      - Tommi Höynälänmaa



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