Rewrite REPL test parser

- Use a recursive descent parser so that it's easy to extend.
- Add `@args` to enable customizing command-line arguments
- Add `@should-start` to enable `nix repl` tests that error before
  entering the REPL
- Make sure to read all stdout output before comparing. This catches
  some extra output we were tossing out before!

Change-Id: I5522555df4c313024ab15cd10f9f04e7293bda3a

1 files changed, 16 insertions, 0 deletions

diff --git a/tests/functional/repl_characterization/data/regression_9918.test b/tests/functional/repl_characterization/data/regression_9918.test
index c30c405b6..a85d6d33a 100644
--- a/tests/functional/repl_characterization/data/regression_9918.test
+++ b/tests/functional/repl_characterization/data/regression_9918.test
@@ -1,3 +1,4 @@
+@args --debugger
   error:
          … while evaluating the error message passed to builtin.throw
 
@@ -14,3 +15,18 @@ We expect to be able to see locals like r in the debugger:
 
   Env level 1
   abort baseNameOf break builtins derivation derivationStrict dirOf false fetchGit fetchMercurial fetchTarball fetchTree fromTOML import isNull map null placeholder removeAttrs scopedImport throw toString true
+
+  nix-repl> :quit
+  error:
+         … while evaluating the file '$TEST_DATA/regression_9918.nix':
+
+         … while calling the 'throw' builtin
+           at $TEST_DATA/regression_9918.nix:3:7:
+              2|   r = [];
+              3|   x = builtins.throw r;
+               |       ^
+              4| in
+
+         … while evaluating the error message passed to builtin.throw
+
+         error: cannot coerce a list to a string: [ ]