String::.ctor(ReadOnlySpan<char> span)

gistfile1.txt

// csc /noconfig /nostdlib /r:System.Private.CoreLib.dll test.cs

using System;
using Internal.Runtime.Augments;

class My {

static void Work() {
   for (;;) GC.Collect();
}

static object[] a = new object[1000];

static void Main() {
    RuntimeThread.Create(Work).Start();
    var r = new Random();
    var s = new ReadOnlySpan<char>("Hello".ToCharArray());
    for (;;) {
        a[r.Next(a.Length)] = new String(s);
    }
}

}