private BoundExpression BindAssignmentExpression(AssignmentExpressionSyntax syntax)
{
if (syntax.IdentifierToken.IsMissing)
{
throw new NotSupportedException();
}
var name = syntax.IdentifierToken.Text;
var boundExpression = BindExpression(syntax.Expression);
if (!_scope.TryLookup(name, out var variable))
{
_diagnostics.ReportUndefinedName(syntax.IdentifierToken.Span, name);
return(boundExpression);
}
if (variable.IsReadOnly)
{
_diagnostics.ReportCannotAssignVariable(syntax.EqualsToken.Span, name);
return(boundExpression);
}
if (boundExpression.Type != variable.Type)
{
_diagnostics.ReportCannotConvert(syntax.Expression.Span, boundExpression.Type, variable.Type);
return(boundExpression);
}
return(new BoundAssignmentExpression(variable, boundExpression));
}
