Missed ambiguous condition

[ruv]

An ambiguous condition is missed for MARKER, which is declared for FORGET.

Something like:
an ambiguous condition exists if definitions or data required for correct execution of the program are removed during execution of name.

See also a comment.

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An ambiguous condition is missed for 17.6.1.0245 /STRING when n is negative and the resulting character string goes beyond the data space.

[ruv]

An ambiguous condition is missed for ALSO, when the search order is empty.

Probably, it's better to specify a throw code for this case (see the issue Eliminating of some ambiguous conditions).

[update] this issue was already discussed in comp.lang.forth in 2008. m_l_g3 wrote on 2008-12-16:

I change my mind and propose to declare it an ambiguous condition
in all affected words (FORTH ALSO DEFINITIONS).

[update] see also: 16.4.1.2 Ambiguous conditions — only PREVIOUS is mentioned with "search order empty".