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NilPy: cannot subscript a string LITERAL — "abc"[1]

Found 2026-07-19 alongside [[bug-nilpy-str-index-off-by-one]].

print("abc"[1])



pascal26: error: unexpected token (   near: abc >>>

Same root shape as the str-method case: the subscript is parsed in ParseLValueAST, and a literal is not an lvalue, so the [ is never consumed. An ident, field or call-result base is fine.

Fix shape: the ParseFactor wrapper added for str methods ([[feature-a-nilpy-str-method-parser-hook]]) is the natural home — give it a subscript suffix alongside the .method( suffix, routed through PyMakeStrIndex so it inherits the 0-based/negative semantics for free.

Low priority: rare in real code and in the uforth corpus (which indexes variables, not literals).

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