[Narek-Khachikyan]

Summary

search('( "length" )(@)', {"x": 1}) calls length and returns 1, bypassing the existing prohibition on quoted function names.

_token_nud_lparen discards grouping in the AST, while _token_led_lparen checks only that its left AST node is a field. A parenthesized quoted or unquoted field is therefore misclassified as a function name. Checking the immediately preceding token preserves the lexical restriction.

Expected: Compilation raises ParseError: a function call requires an unquoted function name followed directly by its argument parentheses.

- infer function names from field AST nodes
+ also require an unquoted identifier token

Evidence

JMESPATH_TEST=tests/compliance/function_name_syntax.json .tox/campaign/bin/python -m pytest tests/test_compliance.py -q --tb=short detects the baseline error and passes with the fix; the full pytest suite with branch coverage passes.

Merge Danger

Door: two-way. Focused correction with regression tests; no new API.

Blast Radius: parsing.