Add test case to show regression 1166

Signed-off-by: Rudi Grinberg <rudi.grinberg@gmail.com>

test/blackbox-tests/dune.inc

@@ -55,6 +55,14 @@
    (progn (run %{exe:cram.exe} -test run.t) (diff? run.t run.t.corrected))))
  (enabled_if (<> %{ocaml-config:system} win)))
 
+(alias
+ (name configurator-gh1166)
+ (deps (package dune) (source_tree test-cases/configurator-gh1166))
+ (action
+  (chdir
+   test-cases/configurator-gh1166
+   (progn (run %{exe:cram.exe} -test run.t) (diff? run.t run.t.corrected)))))
+
 (alias
  (name copy_files)
  (deps (package dune) (source_tree test-cases/copy_files))
@@ -822,6 +830,7 @@
   (alias byte-code-only)
   (alias c-stubs)
   (alias configurator)
+  (alias configurator-gh1166)
   (alias copy_files)
   (alias cross-compilation)
   (alias custom-build-dir)
@@ -923,6 +932,7 @@
   (alias byte-code-only)
   (alias c-stubs)
   (alias configurator)
+  (alias configurator-gh1166)
   (alias copy_files)
   (alias cross-compilation)
   (alias custom-build-dir)

test/blackbox-tests/test-cases/configurator-gh1166/discover.ml

@@ -0,0 +1,4 @@
+let () =
+  let module C = Configurator.V1 in
+  C.main ~name:"foo" (fun _c ->
+    C.Flags.write_lines "foo" ["asdf"])

test/blackbox-tests/test-cases/configurator-gh1166/dune

@@ -0,0 +1,4 @@
+(executable
+ (name discover)
+ (modules discover)
+ (libraries dune.configurator))

test/blackbox-tests/test-cases/configurator-gh1166/dune-project

@@ -0,0 +1 @@
+(lang dune 1.1)

test/blackbox-tests/test-cases/configurator-gh1166/run.t

@@ -0,0 +1,60 @@
+  $ dune exec ./discover.exe
+  run: /Users/rgrinberg/.opam/4.06.1/bin/ocamlc.opt -config
+  -> process exited with code 0
+  -> stdout:
+   | version: 4.06.1
+   | standard_library_default: /Users/rgrinberg/.opam/4.06.1/lib/ocaml
+   | standard_library: /Users/rgrinberg/.opam/4.06.1/lib/ocaml
+   | standard_runtime: /Users/rgrinberg/.opam/4.06.1/bin/ocamlrun
+   | ccomp_type: cc
+   | c_compiler: cc
+   | ocamlc_cflags: -O2 -fno-strict-aliasing -fwrapv 
+   | ocamlc_cppflags: -D_FILE_OFFSET_BITS=64 -D_REENTRANT
+   | ocamlopt_cflags: -O2 -fno-strict-aliasing -fwrapv
+   | ocamlopt_cppflags: -D_FILE_OFFSET_BITS=64 -D_REENTRANT
+   | bytecomp_c_compiler: cc -O2 -fno-strict-aliasing -fwrapv  -D_FILE_OFFSET_BITS=64 -D_REENTRANT
+   | native_c_compiler: cc -O2 -fno-strict-aliasing -fwrapv -D_FILE_OFFSET_BITS=64 -D_REENTRANT
+   | bytecomp_c_libraries: -lcurses -lpthread                  
+   | native_c_libraries: 
+   | native_pack_linker: ld -r -o 
+   | ranlib: ranlib
+   | cc_profile: -pg
+   | architecture: amd64
+   | model: default
+   | int_size: 63
+   | word_size: 64
+   | system: macosx
+   | asm: clang -arch x86_64 -Wno-trigraphs -c
+   | asm_cfi_supported: true
+   | with_frame_pointers: false
+   | ext_exe: 
+   | ext_obj: $ext_obj
+   | ext_asm: $ext_asm
+   | ext_lib: $ext_lib
+   | ext_dll: $ext_dll
+   | os_type: Unix
+   | default_executable_name: a.out
+   | systhread_supported: true
+   | host: x86_64-apple-darwin17.5.0
+   | target: x86_64-apple-darwin17.5.0
+   | profiling: true
+   | flambda: false
+   | spacetime: false
+   | safe_string: false
+   | default_safe_string: true
+   | flat_float_array: true
+   | afl_instrument: false
+   | windows_unicode: false
+   | exec_magic_number: Caml1999X011
+   | cmi_magic_number: Caml1999I022
+   | cmo_magic_number: Caml1999O022
+   | cma_magic_number: Caml1999A022
+   | cmx_magic_number: Caml1999Y022
+   | cmxa_magic_number: Caml1999Z022
+   | ast_impl_magic_number: Caml1999M022
+   | ast_intf_magic_number: Caml1999N022
+   | cmxs_magic_number: Caml1999D022
+   | cmt_magic_number: Caml1999T022
+  -> stderr:
+  Fatal error: exception Stdune__Exn.Code_error(_)
+  [2]