Don't report a shared fragment as a fragment cycle - #886
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`validateVariablesAndFragments` accumulated visited fragments into a single
`seen` set spanning the whole traversal rather than tracking the fragments on
the current path. A fragment reachable by more than one path was therefore
reported as a cycle, e.g.
fragment a on T { x { ...c } y { ...b } }
fragment b on U { z { ...c } }
fragment c on V { w }
failed with "Fragment cycle starting from 'a'".
Replace the check with a proper DFS: `path` holds the fragments on the current
traversal path and `done` those already explored in full, a fragment joins
`done` only after its references have been explored, and the `path` check
precedes the `done` check. Genuine recursion is still detected, and reported
against the same fragment as before.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Lyt6Er1f7k4DDcNBoZEUGS
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validateVariablesAndFragmentsaccumulated visited fragments into a singleseenset spanning the whole traversal rather than tracking the fragments on the current path. A fragment reachable by more than one path was therefore reported as a cycle, e.g.failed with "Fragment cycle starting from 'a'".
Replace the check with a proper DFS:
pathholds the fragments on the current traversal path anddonethose already explored in full, a fragment joinsdoneonly after its references have been explored, and thepathcheck precedes thedonecheck. Genuine recursion is still detected, and reported against the same fragment as before.Claude-Session: https://claude.ai/code/session_01Lyt6Er1f7k4DDcNBoZEUGS