# Constant "type parameter" and inner constructor error message
**URL:** https://discourse.julialang.org/t/constant-type-parameter-and-inner-constructor-error-message/7332
**Category:** General Usage
**Tags:** question
**Created:** [November 27, 2017, 1:33pm UTC](https://discourse.julialang.org/t/constant-type-parameter-and-inner-constructor-error-message/7332 "2017-11-27T13:33:32Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)
#### Post date: [November 27, 2017, 1:33pm UTC](https://discourse.julialang.org/t/constant-type-parameter-and-inner-constructor-error-message/7332/1 "2017-11-27T13:33:32Z")
The following is an MWE from a typo that I made during refactoring some code:
```julia
struct Foo{Float64}
x::Int
Foo() = new(1)
end
```
that gave the curious error message
```julia
WARNING: deprecated syntax "inner constructor Foo(...) around /tmp/e.jl:3".
Use "Foo{Float64}(...) where Float64" instead.
```
Am I right in thinking that in
```julia
struct Foo{Float64}
x::Int
Foo{Float64}() where Float64 = new(1)
end
```
the `Float64` is a type parameter, eg fully replaceable with `T` or something without changing the semantics?
---
### Author:  [@mauro3](https://discourse.julialang.org/u/mauro3)
#### Post date: [November 27, 2017, 1:54pm UTC](https://discourse.julialang.org/t/constant-type-parameter-and-inner-constructor-error-message/7332/2 "2017-11-27T13:54:50Z")
Yes, this is equivalent to:
```julia
struct Foo{T}
x::Int
Foo{T}() where T = new(1)
end
```
---
### Author:  [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)
#### Post date: [November 27, 2017, 2:21pm UTC](https://discourse.julialang.org/t/constant-type-parameter-and-inner-constructor-error-message/7332/3 "2017-11-27T14:21:19Z")
I wonder if this (_type parameter name_ coinciding with _type name_) would deserve at least a warning, or I was just staring at it for 5 minutes because this has been a long day 😄