Add notes on codegen, and regenerate

build_pycompat.py

@@ -189,6 +189,10 @@ def test_fuzzy_simple(i, s):
 
 # Here lies all the ugly junk.
 TEST_HEADER = '''
+//! This code has been generated by running the `build_pycompat.py` script
+//! in the repository root. Please do not edit it, as your edits will be destroyed
+//! upon re-running code generation.
+
 extern crate chrono;
 
 use chrono::Datelike;

build_pycompat_tokenizer.py

@@ -24,6 +24,10 @@ fn test_tokenize{i}() {{
 
 
 TEST_HEADER = '''
+//! This code has been generated by running the `build_pycompat_tokenizer.py` script
+//! in the repository root. Please do not edit it, as your edits will be destroyed
+//! upon re-running code generation.
+
 use tokenize::Tokenizer;
 
 fn tokenize_assert(test_str: &str, comparison: Vec<&str>) {

src/tests/pycompat_parser.rs

@@ -1,4 +1,8 @@
 
+//! This code has been generated by running the `build_pycompat.py` script
+//! in the repository root. Please do not edit it, as your edits will be destroyed
+//! upon re-running code generation.
+
 extern crate chrono;
 
 use chrono::Datelike;

src/tests/pycompat_tokenizer.rs

@@ -1,4 +1,8 @@
 
+//! This code has been generated by running the `build_pycompat_tokenizer.py` script
+//! in the repository root. Please do not edit it, as your edits will be destroyed
+//! upon re-running code generation.
+
 use tokenize::Tokenizer;
 
 fn tokenize_assert(test_str: &str, comparison: Vec<&str>) {