Fixes

Author: blegat

src/Bridges/Constraint/bridges/set_conversion.jl

@@ -6,6 +6,17 @@
 
   * ``f(x) \\in S1`` into ``f(x) \\in S2``
 
+In order to add this bridge, you need to create a bridge specific
+for a given type `T` and set `S2`:
+```julia
+MOI.Bridges.add_bridge(model, MOI.Bridges.Constraint.SetConversionBridge{T,S2})
+```
+In order to define a bridge with `S2` specified but `T` unspecified, e.g.,
+for `JuMP.add_bridge`, you can use
+```julia
+const MyBridge{T,S1,F} = MOI.Bridges.Constraint.SetConversionBridge{T,S2,S1,F}
+```
+
 See also [`FunctionConversionBridge`](@ref).
 
 ## Source node

test/Bridges/Constraint/set_conversion.jl

@@ -32,9 +32,18 @@ end
 
 Base.convert(::Type{MOI.EqualTo{Float64}}, ::Zero) = MOI.EqualTo(0.0)
 
+function Base.convert(::Type{Zero}, s::MOI.EqualTo)
+    if !iszero(s.value)
+        throw(InexactError(convert, (Zero, s)))
+    end
+    return Zero()
+end
+
+const EqualToBridge{T,S1,F} = MOI.Bridges.Constraint.SetConversionBridge{T,MOI.EqualTo{T},S1,F}
+
 function test_runtests()
     MOI.Bridges.runtests(
-        MOI.Bridges.Constraint.SetConversionBridge{Float64,MOI.EqualTo{Float64},Zero},
+        EqualToBridge,
         model -> begin
             x = MOI.add_variable(model)
             MOI.add_constraint(model, x, Zero())