tests(f2/repl): migrate builtins_warn.test

Change-Id: Iaed1fb8651840b855ec7bdf5087681dc5eb9d54c

tests/functional/repl_characterization/data/builtins_warn.test

@@ -1,13 +0,0 @@
-@args --debugger --option debugger-on-warn true
-Enter debugger with debugger-on-warn set.
-  nix-repl> let inspect = v: builtins.warn "inspect is deprecated" (throw "this happens after"); in inspect { }
-  warning: inspect is deprecated
-  warning: builtins.warn reached
-
-Continuing after the warn then breaks on the `throw`
-  nix-repl> :c
-  error: this happens after
-
-Finally, continuing after that error exits and prints the error
-  nix-repl> :c
-  error: this happens after

tests/functional/repl_characterization/repl_characterization.cc

@@ -176,7 +176,6 @@ TEST_F(ReplSessionTest, tidy)
         runReplTestPath(#name);   \
     }
 
-REPL_TEST(builtins_warn)
 REPL_TEST(no_nested_debuggers);
 REPL_TEST(regression_9917);
 REPL_TEST(regression_9918);

tests/functional2/repl_characterization/builtins/builtins_warn.md

@@ -0,0 +1,37 @@
+---
+args: ['--debugger', '--option', 'debugger-on-warn', 'true']
+---
+
+Enter debugger with debugger-on-warn set.
+
+```nix
+let inspect = v: builtins.warn "inspect is deprecated" (throw "this happens after"); in inspect { }
+```
+```output
+warning: inspect is deprecated
+warning: builtins.warn reached
+
+Added 2 variables.
+```
+
+
+Continue after the warn then breaks on the `throw`
+
+```nix
+:c
+```
+```output
+error: this happens after
+
+Added 2 variables.
+```
+
+
+Finally, continue after that error exits and prints the error
+```nix
+:c
+```
+```output
+error: this happens after
+
+```