Commit 4b894e86 authored by POTTIER Francois's avatar POTTIER Francois

Fix an assertion failure.

A pseudo-token (declared e.g. by %left) could appear in a position where a
normal token was expected (e.g., as an actual parameter of a parameterized
symbol) and that was not detected, giving rise (later on) to an assertion
parent 5b05bee7
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