Flatten method arguments so you can generate an array of items.

2 files changed, 4 insertions, 2 deletions

diff --git a/interpreter.py b/interpreter.py
index b6e98dd..edfe59b 100644
--- a/interpreter.py
+++ b/interpreter.py
@@ -39,8 +39,10 @@ class InvalidArguments(InterpreterException):
 
 def check_stringlist(a, msg='Arguments must be strings.'):
     if not isinstance(a, list):
+        mlog.debug('Not a list:', str(a))
         raise InvalidArguments('Argument not a list.')
     if not all(isinstance(s, str) for s in a):
+        mlog.debug('Element not a string:', str(a))
         raise InvalidArguments(msg)
 
 def noPosargs(f):
@@ -1857,7 +1859,7 @@ class Interpreter():
         (args, kwargs) = self.reduce_arguments(args)
         if method_name == 'extract_objects':
             self.validate_extraction(obj.held_object)
-        return obj.method_call(method_name, args, kwargs)
+        return obj.method_call(method_name, self.flatten(args), kwargs)
 
     # Only permit object extraction from the same subproject
     def validate_extraction(self, buildtarget):
diff --git a/test cases/common/29 pipeline/meson.build b/test cases/common/29 pipeline/meson.build
index faf26af..8418381 100644
--- a/test cases/common/29 pipeline/meson.build
+++ b/test cases/common/29 pipeline/meson.build
@@ -9,7 +9,7 @@ gen = generator(e1, \
  output  : '@BASENAME@.c', # Line continuation inside arguments should work without needing a "\".
  arguments : ['@INPUT@', '@OUTPUT@'])
 
-generated = gen.process('input_src.dat')
+generated = gen.process(['input_src.dat'])
 
 e2 = executable('prog', 'prog.c', generated)