On 2020-07-14 22:37, Marcone via Digitalmars-d-learn wrote:
import std: isUpper, writeln;

void main(){
     writeln(isUpper('A'));
}

Why I get this error? How can I use isUpper()?

Two more options:

either fully qualify the name:

import std;
void main(){
    writeln(std.uni.isUpper('A'));
}

or import locally:

import std;
void main(){
    import std.uni;
    writeln(isUpper('A'));
}

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