e1 [ a0, a1, a2, a3 ,... ]
https://dlang.org/spec/expression.html#index_expressions
The type for a unary expression is incompatible. Print error message.
Mark the operand as will never be dereferenced, which is useful info for @safe checks. Do before semantic() on operands rewrites them.
See Implementation
e1 [ a0, a1, a2, a3 ,... ]
https://dlang.org/spec/expression.html#index_expressions