Inside dmd source tree, under sub-directory test, I do
./run.d compilable/
. This errors as
```
... compilable/json.d -d -preview=dip1000 -o- -X
-Xf/home/per/Work/dmd/test/test_results/compilable/json.out
-fPIC ()==============================
Test 'compilable/json.d' failed. The logged output:
Executing post-test script: tools/postscript.sh
compilable/extra-files/json-postscript.sh compilable json
/home/per/Work/dmd/test/test_results/compilable/json.d.out0
tools/postscript.sh: line 18: /home/per/Work/dmd/test/tools
/home/per/Work/dmd/test/tools/exported_vars.sh: No such file or
directory
/home/per/Work/dmd/generated/linux/release/64/dmd -conf= -m64
-Icompilable -d -preview=dip1000 -o- -X
-Xf/home/per/Work/dmd/test/test_results/compilable/json.out
-fPIC -od/home/per/Work/dmd/test/test_results/compilable
-of/home/per/Work/dmd/test/test_results/compilable/json_0.o -c
compilable/json.d
==============================
Test 'compilable/json.d' failed: Expected rc == 0, but exited
with rc == 1
TARGET FAILED: compilable/json.d
... compilable/ddoc8.d -D
-Dd/home/per/Work/dmd/test/test_results/compilable -o- -fPIC
()==============================
```
What's wrong?
