docs: Add debugging notes + link file from README.

README.md

@@ -5,8 +5,8 @@
 # Sorbet
 
 NOTE: This code is in Sourcegraph's fork of Sorbet, modified to add support
-for emitting SCIP indexes. See scip-ruby.md for details on running tests etc.
-The original README follows below.
+for emitting SCIP indexes. See [scip-ruby.md](./scip-ruby.md) for details
+on running tests etc. The original README follows below.
 
 ---
 

scip-ruby.md

@@ -32,3 +32,28 @@ Updating snapshots
 ```
 ./bazel test //test/scip:update --config=dbg
 ```
+
+## Debugging
+
+So far, I've mostly been using print debugging
+(along with minimized test cases)
+since I find it more helpful to see a bunch of output
+along with the control flow graph all at once.
+
+Typically, I'll copy over the minimized code
+to the root and run:
+
+```
+./bazel build //main:scip-ruby --config=dbg && ./bazel-out/darwin-dbg/bin/main/scip-ruby tmp.rb -p cfg-text --index-file index.scip
+```
+
+Alternately, it may be useful to create a `tmp.rb`
+file under the `test/scip/snapshots/` directory
+(it will be gitignored) and run:
+
+```
+# Check
+./bazel test //test/scip:tmp --config=dbg
+# View output
+./bazel test //test/scip:update_tmp --config=dbg && cat test/scip/snapshots/tmp.snapshot.rb
+```