Gets the set of input symbols which could potentially follow the
previously matched symbol at the time this exception was thrown.
<p>If the set of expected tokens is not known and could not be computed,
this method returns {@code null}.</p>
@return The set of token types that could potentially follow the current
state in the ATN, or {@code null} if the information is not available.
@uml
Gets the set of input symbols which could potentially follow the
previously matched symbol at the time this exception was thrown.
<p>If the set of expected tokens is not known and could not be computed,
this method returns {@code null}.</p>
@return The set of token types that could potentially follow the current
state in the ATN, or {@code null} if the information is not available.
Gets the set of input symbols which could potentially follow the previously matched symbol at the time this exception was thrown.
<p>If the set of expected tokens is not known and could not be computed, this method returns {@code null}.</p>
@return The set of token types that could potentially follow the current state in the ATN, or {@code null} if the information is not available. @uml Gets the set of input symbols which could potentially follow the previously matched symbol at the time this exception was thrown.
<p>If the set of expected tokens is not known and could not be computed, this method returns {@code null}.</p>
@return The set of token types that could potentially follow the current state in the ATN, or {@code null} if the information is not available.