Add tests for rustdoc json

Move rustdoc/rustdoc-json to rustdoc-json

Scaffold rustdoc-json test mode

Implement run_rustdoc_json_test

Fix up python

Make tidy happy

1 files changed, 468 insertions, 0 deletions

diff --git a/src/test/rustdoc-json/structs.expected b/src/test/rustdoc-json/structs.expected
new file mode 100644
index 00000000000..45b23534bc7
--- /dev/null
+++ b/src/test/rustdoc-json/structs.expected
@@ -0,0 +1,468 @@
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