diff --git a/asdl/gen_python.py b/asdl/gen_python.py
index e3a80e30cf..5aa3f50cde 100755
--- a/asdl/gen_python.py
+++ b/asdl/gen_python.py
@@ -121,15 +121,10 @@ class GenMyPyVisitor(visitor.AsdlVisitor):
 
   TODO: Remove the code above.  This should substitute for it.
   """
-  def __init__(self, f, type_lookup, abbrev_mod=None):
+  def __init__(self, f, type_lookup, abbrev_mod_entries=None):
     visitor.AsdlVisitor.__init__(self, f)
     self.type_lookup = type_lookup
-    if abbrev_mod:
-      self.abbrev_mod_name = abbrev_mod.__name__.split('.')[-1]
-      self.abbrev_mod_entries = dir(abbrev_mod)
-    else:
-      self.abbrev_mod_name = ''
-      self.abbrev_mod_entries = []
+    self.abbrev_mod_entries = abbrev_mod_entries or []
 
   def VisitSimpleSum(self, sum, name, depth):
     # First emit a type
@@ -336,8 +331,9 @@ def _GenClass(self, desc, class_name, super_name, depth, tag_num=None):
 
     self.Emit('  def AbbreviatedTree(self):')
     self.Emit('    # type: () -> PrettyNode')
-    if class_name in self.abbrev_mod_entries:
-      self.Emit('    p = %s.%s(self)' % (self.abbrev_mod_name, class_name))
+    abbrev_name = '_%s' % class_name
+    if abbrev_name in self.abbrev_mod_entries:
+      self.Emit('    p = %s(self)' % abbrev_name)
       # If the user function didn't return anything, fall back.
       self.Emit('    return p if p else self._AbbreviatedTree()')
     else:
diff --git a/asdl/typed.sh b/asdl/typed.sh
index 2d68be1e72..a8c9f45a92 100755
--- a/asdl/typed.sh
+++ b/asdl/typed.sh
@@ -33,7 +33,6 @@ typecheck() {
 
 check-arith() {
   local strict='--strict'
-  #strict=''
   MYPYPATH=. PYTHONPATH=. typecheck $strict \
     asdl/typed_arith_parse.py asdl/typed_arith_parse_test.py asdl/tdop.py
 }
diff --git a/asdl/typed_arith_abbrev.py b/asdl/typed_arith_abbrev.py
index 9f762e3196..f87a0dcd32 100644
--- a/asdl/typed_arith_abbrev.py
+++ b/asdl/typed_arith_abbrev.py
@@ -1,19 +1,11 @@
-#!/usr/bin/python
 """
-typed_arith_abbrev.py
+typed_arith_abbrev.py - Abbreviations for pretty-printing typed_arith.asdl.
 """
-from __future__ import print_function
-
-# Causes a circular import!  Gah.
-#from _devbuild.gen import typed_arith_asdl as A
-#from typing import Optional
 
 from asdl import runtime
-_PrettyBase = runtime._PrettyBase
-
 
-def arith_expr__Unary(obj):
-  # X type: (A.arith_expr__Unary) -> Optional[_PrettyBase]
+def _arith_expr__Unary(obj):
+  # type: (arith_expr__Unary) -> Optional[runtime.PrettyNode]
 
   p_node = runtime.PrettyNode()
   p_node.abbrev = True
@@ -24,8 +16,8 @@ def arith_expr__Unary(obj):
   return p_node
 
 
-def arith_expr__Binary(obj):
-  # X type: (A.arith_expr__Binary) -> Optional[_PrettyBase]
+def _arith_expr__Binary(obj):
+  # type: (arith_expr__Binary) -> Optional[runtime.PrettyNode]
 
   if obj.op == '=':  # test for fallback
     return None
@@ -40,16 +32,18 @@ def arith_expr__Binary(obj):
   return p_node
 
 
-def arith_expr__Const(obj):
+def _arith_expr__Const(obj):
+  # type: (arith_expr__Const) -> Optional[runtime.PrettyNode]
   p_node = runtime.PrettyNode()
   p_node.abbrev = True
-  p_node.node_type = None  # omit it
+  p_node.node_type = ''  # omit it
   n = runtime.PrettyLeaf(str(obj.i), runtime.Color_OtherConst)
   p_node.unnamed_fields.append(n)
   return p_node
 
 
-def arith_expr__Var(obj):
+def _arith_expr__Var(obj):
+  # type: (arith_expr__Var) -> Optional[runtime.PrettyNode]
   p_node = runtime.PrettyNode()
   p_node.abbrev = True
   p_node.node_type = '$'
diff --git a/core/asdl_gen.py b/core/asdl_gen.py
index dfcce442f1..460e026a32 100755
--- a/core/asdl_gen.py
+++ b/core/asdl_gen.py
@@ -103,14 +103,21 @@ def main(argv):
 
 """)
 
-    # TODO: inline the module at the END
+    abbrev_mod_entries = dir(abbrev_mod) if abbrev_mod else []
+    v = gen_python.GenMyPyVisitor(f, type_lookup, abbrev_mod_entries)
+    v.VisitModule(schema_ast)
+
     if abbrev_mod:
-      package, module = abbrev_module_name.split('.')
-      f.write('from %s import %s\n' % (package, module))
-      f.write('\n')
+      f.write("""\
+#
+# CONCATENATED FILE
+#
 
-    v = gen_python.GenMyPyVisitor(f, type_lookup, abbrev_mod)
-    v.VisitModule(schema_ast)
+""")
+      package, module = abbrev_module_name.split('.')
+      path = os.path.join(package, module + '.py')
+      with open(path) as in_f:
+        f.write(in_f.read())
 
   else:
     raise RuntimeError('Invalid action %r' % action)
diff --git a/frontend/syntax_abbrev.py b/frontend/syntax_abbrev.py
index f5118280db..c1acd57e7a 100644
--- a/frontend/syntax_abbrev.py
+++ b/frontend/syntax_abbrev.py
@@ -1,10 +1,7 @@
-#!/usr/bin/python
 """
 syntax_abbrev.py - Abbreviations for pretty-printing syntax.asdl.
 """
 
-import sys
-
 from asdl import runtime
 from core.meta import Id
 
@@ -18,7 +15,7 @@ def _AbbreviateToken(token, out):
   out.append(n2)
 
 
-def token(obj):
+def _token(obj):
   p_node = runtime.PrettyNode()
   p_node.abbrev = True
   p_node.node_type = ''  # don't show
@@ -29,7 +26,7 @@ def token(obj):
   return p_node
 
 
-def word_part__LiteralPart(obj):
+def _word_part__LiteralPart(obj):
   p_node = runtime.PrettyNode()
   p_node.abbrev = True
   p_node.node_type = ''  # don't show
@@ -38,7 +35,7 @@ def word_part__LiteralPart(obj):
   return p_node
 
 
-def word_part__SimpleVarSub(obj):
+def _word_part__SimpleVarSub(obj):
   p_node = runtime.PrettyNode()
   p_node.abbrev = True
   p_node.node_type = '$'
@@ -46,7 +43,7 @@ def word_part__SimpleVarSub(obj):
   return p_node
 
 
-def word_part__BracedVarSub(obj):
+def _word_part__BracedVarSub(obj):
   p_node = runtime.PrettyNode()
   if obj.prefix_op or obj.bracket_op or obj.suffix_op:
     return None  # we have other fields to display; don't abbreviate
@@ -57,7 +54,7 @@ def word_part__BracedVarSub(obj):
   return p_node
 
 
-def word_part__DoubleQuotedPart(obj):
+def _word_part__DoubleQuotedPart(obj):
   p_node = runtime.PrettyNode()
   p_node.abbrev = True
   p_node.node_type = 'DQ'
@@ -67,7 +64,7 @@ def word_part__DoubleQuotedPart(obj):
   return p_node
 
 
-def word_part__SingleQuotedPart(obj):
+def _word_part__SingleQuotedPart(obj):
   # Only abbreviate 'foo', not $'foo\n'
   if obj.left.id != Id.Left_SingleQuote:
     return None  # Fall back on obj._AbbreviatedTree()
@@ -81,7 +78,7 @@ def word_part__SingleQuotedPart(obj):
   return p_node
 
 
-def word__CompoundWord(obj):
+def _word__CompoundWord(obj):
   p_node = runtime.PrettyNode()
   p_node.abbrev = True
   p_node.node_type = ''  # don't show
@@ -93,7 +90,7 @@ def word__CompoundWord(obj):
   return p_node
 
 
-def command__SimpleCommand(obj):
+def _command__SimpleCommand(obj):
   p_node = runtime.PrettyNode()
   if obj.redirects or obj.more_env:
     return None  # we have other fields to display; don't abbreviate
diff --git a/test/lint.sh b/test/lint.sh
index e6e8a7a7e7..ac291d484b 100755
--- a/test/lint.sh
+++ b/test/lint.sh
@@ -106,8 +106,9 @@ flake8-all() {
   # astgen.py has a PROLOGUE which must have unused imports!
   # opcode.py triggers a flake8 bug?  Complains about def_op() when it is
   # defined.
+  # _abbrev.py modules are concatenated, and don't need to check on their own.
   local -a exclude=(
-    --exclude 'opy/_regtest,opy/byterun,opy/tools/astgen.py,opy/lib/opcode.py')
+    --exclude 'opy/_regtest,opy/byterun,opy/tools/astgen.py,opy/lib/opcode.py,*/*_abbrev.py')
 
   # Step 1: Stop the build if there are Python syntax errors, undefined names,
   # unused imports