Warning when using LinearOperators.jl

[amontoison]

 4 dependencies successfully precompiled in 5 seconds. 72 already precompiled.
  1 dependency had output during precompilation:
┌ LinearOperators
│  WARNING: method definition for #opCholesky#87 at /home/alexis/.julia/packages/LinearOperators/spFlJ/src/linalg.jl:44 declares type variable T but does not use it.
│  WARNING: method definition for #opLDL#94 at /home/alexis/.julia/packages/LinearOperators/spFlJ/src/linalg.jl:67 declares type variable T but does not use it.
│  WARNING: method definition for opRestriction at /home/alexis/.julia/packages/LinearOperators/spFlJ/src/special-operators.jl:175 declares type variable T but does not use it.
│  WARNING: method definition for BlockDiagonalOperator at /home/alexis/.julia/packages/LinearOperators/spFlJ/src/special-operators.jl:231 declares type variable S but does not use it.
└