Add test demonstrating issue

tests/test-dirs/occurrences/project-wide/pwo-canonicalize.t

@@ -0,0 +1,68 @@
+  $ cat > lib.ml << EOF
+  > let foo = "bar"
+  > let () = print_string foo
+  > EOF
+
+  $ cat > main.ml << EOF
+  > let () = print_string Lib.foo
+  > EOF
+
+  $ cat > .merlin << EOF
+  > INDEX project.ocaml-index
+  > SOURCE_ROOT .
+  > EOF
+
+  $ ocamlc -bin-annot -bin-annot-occurrences -c lib.ml main.ml
+  $ ocaml-index aggregate main.cmt lib.cmt --root . --rewrite-root
+
+TODO: definition is duplicated
+TODO: result paths have a . in them
+
+  $ ocamlmerlin single occurrences -scope project -identifier-at 1:4 \
+  > -filename lib.ml < lib.ml | jq .value
+  [
+    {
+      "file": "$TESTCASE_ROOT/lib.ml",
+      "start": {
+        "line": 1,
+        "col": 4
+      },
+      "end": {
+        "line": 1,
+        "col": 7
+      }
+    },
+    {
+      "file": "$TESTCASE_ROOT/./lib.ml",
+      "start": {
+        "line": 1,
+        "col": 4
+      },
+      "end": {
+        "line": 1,
+        "col": 7
+      }
+    },
+    {
+      "file": "$TESTCASE_ROOT/./lib.ml",
+      "start": {
+        "line": 2,
+        "col": 22
+      },
+      "end": {
+        "line": 2,
+        "col": 25
+      }
+    },
+    {
+      "file": "$TESTCASE_ROOT/./main.ml",
+      "start": {
+        "line": 1,
+        "col": 26
+      },
+      "end": {
+        "line": 1,
+        "col": 29
+      }
+    }
+  ]