diff --git a/artiq/compiler/embedding.py b/artiq/compiler/embedding.py
index bf1ed49d0..3dacbdc13 100644
--- a/artiq/compiler/embedding.py
+++ b/artiq/compiler/embedding.py
@@ -184,9 +184,10 @@ class Stitcher:
             inferencer.visit(self.typedtree)
 
         # After we have found all functions, synthesize a module to hold them.
+        source_buffer = source.Buffer("", "<synthesized>")
         self.typedtree = asttyped.ModuleT(
             typing_env=self.globals, globals_in_scope=set(),
-            body=self.typedtree, loc=None)
+            body=self.typedtree, loc=source.Range(source_buffer, 0, 0))
 
     def _quote_embedded_function(self, function):
         if not hasattr(function, "artiq_embedded"):
diff --git a/artiq/compiler/ir.py b/artiq/compiler/ir.py
index 327e8c5f6..2561d4ea4 100644
--- a/artiq/compiler/ir.py
+++ b/artiq/compiler/ir.py
@@ -138,6 +138,9 @@ class User(NamedValue):
 class Instruction(User):
     """
     An SSA instruction.
+
+    :ivar loc: (:class:`pythonparser.source.Range` or None)
+        source location
     """
 
     def __init__(self, operands, typ, name=""):
@@ -388,13 +391,15 @@ class Function:
     """
     A function containing SSA IR.
 
+    :ivar loc: (:class:`pythonparser.source.Range` or None)
+        source location of function definition
     :ivar is_internal:
         (bool) if True, the function should not be accessible from outside
         the module it is contained in
     """
 
-    def __init__(self, typ, name, arguments):
-        self.type, self.name = typ, name
+    def __init__(self, typ, name, arguments, loc=None):
+        self.type, self.name, self.loc = typ, name, loc
         self.names, self.arguments, self.basic_blocks = set(), [], []
         self.next_name = 1
         self.set_arguments(arguments)
diff --git a/artiq/compiler/transforms/artiq_ir_generator.py b/artiq/compiler/transforms/artiq_ir_generator.py
index f30250d92..b0ce78c91 100644
--- a/artiq/compiler/transforms/artiq_ir_generator.py
+++ b/artiq/compiler/transforms/artiq_ir_generator.py
@@ -129,7 +129,8 @@ class ARTIQIRGenerator(algorithm.Visitor):
 
         try:
             typ = types.TFunction(OrderedDict(), OrderedDict(), builtins.TNone())
-            func = ir.Function(typ, ".".join(self.name + ['__modinit__']), [])
+            func = ir.Function(typ, ".".join(self.name + ['__modinit__']), [],
+                               loc=node.loc.begin())
             self.functions.append(func)
             old_func, self.current_function = self.current_function, func
 
@@ -184,7 +185,8 @@ class ARTIQIRGenerator(algorithm.Visitor):
             for arg_name in typ.optargs:
                 optargs.append(ir.Argument(ir.TOption(typ.optargs[arg_name]), "arg." + arg_name))
 
-            func = ir.Function(typ, ".".join(self.name), [env_arg] + args + optargs)
+            func = ir.Function(typ, ".".join(self.name), [env_arg] + args + optargs,
+                               loc=node.keyword_loc)
             func.is_internal = is_internal
             self.functions.append(func)
             old_func, self.current_function = self.current_function, func