I am new to Julia and the REPL answers seems strange to me:

When I run this *uncorrect* code :

```
mat = [1 2 3; 4 5 6]

function minus(mat::Array{Int64,2}, min)::Array{UInt8,2}
    out = mat-min;
    # out = UInt8.(out);
    return out;
end

minmat = minus(mat);

```

I get this *correct* error message :

```
ERROR: LoadError: MethodError: no method matching minus(::Array{Int64,2})
Closest candidates are:
  minus(::Array{Int64,2}, ::Any) at /home/hugo/dev/julia/test.jl:5

```

But when I run this *correct* (I guess) code :

```
mat = [1 2 3; 4 5 6]

function minus(mat::Array{Int64,2}, min)::Array{UInt8,2}
    out = mat-min;
    # out = UInt8.(out);
    return out;
end

minmat = minus(mat, 1);

```

Julia gives me this ~~*incorrect*~~ error message :

```
ERROR: LoadError: MethodError: no method matching -(::Array{Int64,2}, ::Int64)
Closest candidates are:
  -(::Complex{Bool}, ::Real) at complex.jl:298
  -(::Missing, ::Number) at missing.jl:93
  -(::Base.CoreLogging.LogLevel, ::Integer) at logging.jl:107
  ...

```

(notice the '-' in the function signature)

I see nothing related to this in the doc, so I am a bit confused, that's why I'm asking here.