# \`JuMP\` macros with \`RuntimeGeneratedFunctions\`
**URL:** https://discourse.julialang.org/t/jump-macros-with-runtimegeneratedfunctions/127815
**Category:** Optimization (Mathematical)
**Created:** [April 7, 2025, 7:47pm UTC](https://discourse.julialang.org/t/jump-macros-with-runtimegeneratedfunctions/127815 "2025-04-07T19:47:48Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@sstroemer](https://discourse.julialang.org/u/sstroemer)
#### Post date: [April 7, 2025, 7:47pm UTC](https://discourse.julialang.org/t/jump-macros-with-runtimegeneratedfunctions/127815/1 "2025-04-07T19:47:48Z")
The following MWE
```julia
import JuMP, RuntimeGeneratedFunctions
RuntimeGeneratedFunctions.init(@ __MODULE__ )
code = """
model = JuMP.owner_model(x[1])
JuMP.@constraint(model, [t = 1:10], x[t] >= 0)
"""
code_ex = Meta.parse("""begin\n$(code)\nend""")
rgf = RuntimeGeneratedFunctions.@RuntimeGeneratedFunction(
:(function (x)
$code_ex
end)
)
rgf(JuMP.@variable(JuMP.Model(), [1:10]))
```
fails with
```console
ERROR: The function body AST defined by this @generated function is not pure. This likely means it contains a closure, a comprehension or a generator.
```
whereas it works when manually creating each constraint using
```julia
code = """
for t = 1:10
JuMP.@constraint(JuMP.owner_model(x[t]), x[t] >= 0)
end
"""
```
Am I misusing `RuntimeGeneratedFunctions`? Or is there something else I can do to work around this?
---
### Author:  [@odow](https://discourse.julialang.org/u/odow)
#### Post date: [April 7, 2025, 10:36pm UTC](https://discourse.julialang.org/t/jump-macros-with-runtimegeneratedfunctions/127815/2 "2025-04-07T22:36:01Z")
The error seems pretty reasonable.
The expanded code from `@constraint` contains a bunch of stuff that `RuntimeGeneratedFunctions` might find troublesome:
```Julia
julia> using JuMP
julia> begin
model = Model()
@variable(model, x[1:10])
@macroexpand @constraint(model, [t = 1:10], x[t] >= 0)
end
quote
#= REPL[6]:4 =#
JuMP._valid_model(model, :model)
begin
#= /Users/oscar/.julia/dev/JuMP/src/macros.jl:399 =#
let model = model
#= /Users/oscar/.julia/dev/JuMP/src/macros.jl:400 =#
(JuMP.Containers.container)(((t,)->begin
#= /Users/oscar/.julia/dev/JuMP/src/Containers/macro.jl:550 =#
begin
#= /Users/oscar/.julia/dev/JuMP/src/macros/@constraint.jl:171 =#
begin
#= /Users/oscar/.julia/dev/JuMP/src/macros.jl:264 =#
var"#18###233" = begin
#= /Users/oscar/.julia/packages/MutableArithmetics/tNSBd/src/rewrite.jl:374 =#
let
#= /Users/oscar/.julia/packages/MutableArithmetics/tNSBd/src/rewrite.jl:375 =#
begin
#= /Users/oscar/.julia/packages/MutableArithmetics/tNSBd/src/rewrite.jl:371 =#
var"#19###234" = (MutableArithmetics.copy_if_mutable)(x[t])
var"#20###235" = (MutableArithmetics.operate!!)(MutableArithmetics.sub_mul, var"#19###234", 0)
end
#= /Users/oscar/.julia/packages/MutableArithmetics/tNSBd/src/rewrite.jl:376 =#
var"#20###235"
end
end
#= /Users/oscar/.julia/dev/JuMP/src/macros.jl:265 =#
var"#21###236" = (JuMP.flatten!)(var"#18###233")
end
#= /Users/oscar/.julia/dev/JuMP/src/macros/@constraint.jl:172 =#
var"#22#build" = JuMP.model_convert(model, JuMP.build_constraint(JuMP.Containers.var"#error_fn#98"{String}("At REPL[6]:4: `@constraint(model, [t = 1:10], x[t] >= 0)`: "), JuMP._functionize(var"#21###236"), GreaterThanZero()))
#= /Users/oscar/.julia/dev/JuMP/src/macros/@constraint.jl:173 =#
JuMP.add_constraint(model, var"#22#build", "")
end
end), (JuMP.Containers).vectorized_product((JuMP.Base).OneTo(begin
#= /Users/oscar/.julia/dev/JuMP/src/Containers/macro.jl:95 =#
try
#= /Users/oscar/.julia/dev/JuMP/src/Containers/macro.jl:96 =#
1:10
catch
#= /Users/oscar/.julia/dev/JuMP/src/Containers/macro.jl:98 =#
(JuMP.Containers.var"#error_fn#98"{String}("At REPL[6]:4: `@constraint(model, [t = 1:10], x[t] >= 0)`: "))("unexpected error parsing reference set: ", $(Expr(:copyast, :($(QuoteNode(:(1:10)))))))
end
end)), JuMP.Containers.AutoContainerType, Any[:t])
end
end
end
```
If you compare it to
```julia
julia> using JuMP
julia> begin
model = Model()
@variable(model, x[1:10])
t = 1
@macroexpand @constraint(model, x[t] >= 0)
end
quote
#= REPL[8]:5 =#
JuMP._valid_model(model, :model)
begin
#= /Users/oscar/.julia/dev/JuMP/src/macros.jl:399 =#
let model = model
#= /Users/oscar/.julia/dev/JuMP/src/macros.jl:400 =#
begin
#= /Users/oscar/.julia/dev/JuMP/src/macros/@constraint.jl:171 =#
begin
#= /Users/oscar/.julia/dev/JuMP/src/macros.jl:264 =#
var"#28###238" = begin
#= /Users/oscar/.julia/packages/MutableArithmetics/tNSBd/src/rewrite.jl:374 =#
let
#= /Users/oscar/.julia/packages/MutableArithmetics/tNSBd/src/rewrite.jl:375 =#
begin
#= /Users/oscar/.julia/packages/MutableArithmetics/tNSBd/src/rewrite.jl:371 =#
var"#29###239" = (MutableArithmetics.copy_if_mutable)(x[t])
var"#30###240" = (MutableArithmetics.operate!!)(MutableArithmetics.sub_mul, var"#29###239", 0)
end
#= /Users/oscar/.julia/packages/MutableArithmetics/tNSBd/src/rewrite.jl:376 =#
var"#30###240"
end
end
#= /Users/oscar/.julia/dev/JuMP/src/macros.jl:265 =#
var"#31###241" = (JuMP.flatten!)(var"#28###238")
end
#= /Users/oscar/.julia/dev/JuMP/src/macros/@constraint.jl:172 =#
var"#32#build" = JuMP.model_convert(model, JuMP.build_constraint(JuMP.Containers.var"#error_fn#98"{String}("At REPL[8]:5: `@constraint(model, x[t] >= 0)`: "), JuMP._functionize(var"#31###241"), GreaterThanZero()))
#= /Users/oscar/.julia/dev/JuMP/src/macros/@constraint.jl:173 =#
JuMP.add_constraint(model, var"#32#build", "")
end
end
end
end
```
you’ll see no closure.