CuTeDSL: staged bool() with no arguments crashes the preprocessor with a raw IndexError #3506

Description

visit_Call in cutlass/base_dsl/ast_preprocessor.py (~line 1971-1987) rewrites a staged bool(...) call into the DSL's bool_cast redirector using args=[node.args[0]] without checking that an argument is present. A jit body containing z = bool() therefore dies with a raw IndexError: list index out of range from inside the preprocessor instead of a proper diagnostic, while the one-argument case goes through bool_cast and produces a clean DSLUserCodeError when the argument is not convertible.

Verified against nvidia-cutlass-dsl==4.7.0; the repo source has the same unguarded node.args[0].

@cute.jit
def f() -> cutlass.Boolean:
    z = bool()
    return cutlass.Boolean(z)

Actual: IndexError: list index out of range (no location info, no suggestion).
Expected: a DSL diagnostic, e.g. DSLUserCodeError explaining that bool() requires exactly one argument.

Suggested fix

Guard the rewrite: if len(node.args) != 1 or node.keywords, leave the call alone (or raise a proper DSLUserCodeError naming the file/function), so the failure carries a normal Python error message instead of an internal IndexError.