diff --git a/DIAGNOSTIC_TODOS.yaml b/DIAGNOSTIC_TESTS.yaml
similarity index 100%
rename from DIAGNOSTIC_TODOS.yaml
rename to DIAGNOSTIC_TESTS.yaml
diff --git a/TODOS.md b/TODOS.md
index 718f913..6a292ad 100644
--- a/TODOS.md
+++ b/TODOS.md
@@ -28,11 +28,11 @@ Remember to polish existing features before moving on to new ones.
     - [ ] write test for error when n == 0
     - [x] warn when using negative numbers
     - [x] warn when using default arg on string
-    - [x] add the above warnings to DIAGNOSTIC_TODOS.md
+    - [x] add the above warnings to DIAGNOSTIC_TESTS.md
     - [ ] Instead of "clearer form", be exact: "last 5"
     - [ ] write tests for `first 0` & `last 0`
     - [ ] update tests to assert diagnostics when appropriate
-      - do we want to do this or just use DIAGNOSTIC_TODOS.md as the tests?
+      - do we want to do this or just use DIAGNOSTIC_TESTS.md as the tests?
       - [ ] also update to use file logger so they don't clog up the output
     - [ ] narrow highlight in diagnostic to relevent part of line.
 
@@ -58,11 +58,11 @@ All diagnostics (errors) should show
 
 - [ ] try to make file paths clickable links.
 - [ ] make sure the frontmatter parser has good diagnostics.
-- [ ] add all known diagnostics to [DIAGNOSTIC TODOS](./DIAGNOSTIC_TODOS.yaml).
-- [ ] fix the broken diagnostics in [DIAGNOSTIC TODOS](./DIAGNOSTIC_TODOS.yaml)
+- [ ] add all known diagnostics to [DIAGNOSTIC TODOS](./DIAGNOSTIC_TESTS.yaml).
+- [ ] fix the broken diagnostics in [DIAGNOSTIC TODOS](./DIAGNOSTIC_TESTS.yaml)
 - [ ] show *stack trace* for template partials?
 - [ ] show where the typo occurred (config file path for `apply_extension_config`, full `-ext:value` for `parse_extension_list`)
-- [ ] **all** diagnostics in [DIAGNOSTIC TODOS](./DIAGNOSTIC_TODOS.yaml) must be tested.
+- [ ] **all** diagnostics in [DIAGNOSTIC TODOS](./DIAGNOSTIC_TESTS.yaml) must be tested.
 - [ ] only report format errors once.
 - [ ] only report missing partial errors once.
 - [ ] better diagnostics for syntax errors in treesitter.
diff --git a/mustache/diagnostic_test.odin b/mustache/diagnostic_test.odin
index acf1f00..120d647 100644
--- a/mustache/diagnostic_test.odin
+++ b/mustache/diagnostic_test.odin
@@ -480,10 +480,10 @@ test_parse_error_pipe_parse_in_inverted_keeps_double_braces :: proc(t: ^testing.
 }
 
 // ---------------------------------------------------------------------------
-// Data-driven diagnostic cases (from DIAGNOSTIC_TODOS.yaml)
+// Data-driven diagnostic cases (from DIAGNOSTIC_TESTS.yaml)
 //
 // write_diagnostic_tests generates diagnostic_test_cases_test.odin from the
-// enabled cases in DIAGNOSTIC_TODOS.yaml. On the first run (or when the YAML
+// enabled cases in DIAGNOSTIC_TESTS.yaml. On the first run (or when the YAML
 // changes), it regenerates the file and fails. On the second run, each case
 // runs as an individual test via run_diag_case.
 // ---------------------------------------------------------------------------
@@ -541,7 +541,7 @@ diag_slug :: proc(name: string) -> string {
 }
 
 run_diag_case :: proc(t: ^testing.T, name: string) {
-	cases := load_diag_cases("../DIAGNOSTIC_TODOS.yaml")
+	cases := load_diag_cases("../DIAGNOSTIC_TESTS.yaml")
 	ctx := diag_ctx()
 	partials := diag_partials()
 
@@ -661,12 +661,12 @@ run_diag_case :: proc(t: ^testing.T, name: string) {
 		return
 	}
 
-	testing.expectf(t, false, "case '%s' not found in DIAGNOSTIC_TODOS.yaml", name)
+	testing.expectf(t, false, "case '%s' not found in DIAGNOSTIC_TESTS.yaml", name)
 }
 
 @(test)
 write_diagnostic_tests :: proc(t: ^testing.T) {
-	cases := load_diag_cases("../DIAGNOSTIC_TODOS.yaml")
+	cases := load_diag_cases("../DIAGNOSTIC_TESTS.yaml")
 	testing.expect(t, len(cases) > 0, "should load diagnostic cases")
 
 	sb: strings.Builder