@x not defined

[DominicWuest]

When running the following query:

MATCH (x)
CALL {
	CALL {
		CALL {
			MERGE ()
			RETURN 0 AS n0
		} MERGE ()
	} RETURN 0 AS n1
} RETURN 0

I encountered the following error:

'@x' not defined

I believe the query mentioned above is semantically and syntactically correct and thus no error should be thrown here.

I encountered this issue when testing queries on the FalkorDB master branch in a Docker container running redis:7.2.3-bookworm.

Steps to reproduce

Run the following query and observe it throws an error:

MATCH (x) CALL { CALL { CALL { MERGE () RETURN 0 AS n0 } MERGE () } RETURN 0 AS n1 } RETURN 0

Expected behavior

The query should run successfully

Actual behavior

The query fails with the error message '@x' not defined