mixed in struct constructor is ignored when another (non mixed in) constructor is specified

[ParticlePeter via Digitalmars-d-learn]

mixin template Common() {
  private int m_member;
  this( int m ) { m_member = m; }
}
struct Foo {
  mixin Common;
}

struct Bar {
  mixin Common;
  this( int m, float n ) { m_member = m * n; }
}


auto foo = Foo(1);       // ok
auto b_1 = Bar( 1, 2 );  // ok
auto b_2 = Bar( 3 );     // Error: constructor main.Bar.this (int 
m, int n) is not callable using argument types (int)

Is this expected behavior?