When aniline is heated with $\mathrm{CHCl}{}_3$ and ethanolic $\mathrm{KOH}$, the foul-smelling product is:

The base converts chloroform into dichlorocarbene, which is attacked by the primary amine and, after loss of two molecules of HCl, gives the isocyanide $\mathrm{RNC}$. Here $\mathrm{R}$ is phenyl, so the product is phenyl isocyanide, not the nitrile.