Proactively compile lambdas when the type of the closure is known #60259
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If a method we precompile instantiates a closure struct, and there is a single
compileable signature for the closure method, we can compile the closure method
with few downsides.
For example:
```
f(x::T) where {T <: Number} = y::T -> x+y
precompile(f, (Int,))
f(1)(2)
```
Before, the closure method would not get precompiled, resulting in
`--trace-compile` output:
`precompile(Tuple{Foo.var"#f##0#f#JuliaLang#1"{Int64, Int64}, Int64})`
This idea was motivated by trying to make the REPL precompile script more
"static". Creating a task with `@task` or `@async` expands into a no-argument
lambda, which won't get precompiled with the containing method.
Member
|
Seems fine, but wouldn't this be better handled by understanding the edge intrinsic that we added (I think) for juliac purposes? |
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vtjnash
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backport 1.13
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aviatesk
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Dec 9, 2025
…0259) If a method we precompile instantiates a closure struct, and there is a single compileable signature for the closure method, we can compile the closure method with few downsides. For example: ```julia f(x::T) where {T <: Number} = y::T -> x+y precompile(f, (Int,)) f(1)(2) ``` Before, the closure method would not get precompiled, resulting in `--trace-compile` output: `precompile(Tuple{Foo.var"#f##0#f##1"{Int64, Int64}, Int64})` This idea was motivated by trying to make the REPL precompile script more "static". Creating a task with `@task` or `@async` expands into a no-argument lambda, which won't get precompiled with the containing method.
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If a method we precompile instantiates a closure struct, and there is a single compileable signature for the closure method, we can compile the closure method with few downsides.
For example:
Before, the closure method would not get precompiled, resulting in
--trace-compileoutput:precompile(Tuple{Foo.var"#f##0#f##1"{Int64, Int64}, Int64})This idea was motivated by trying to make the REPL precompile script more "static". Creating a task with
@taskor@asyncexpands into a no-argument lambda, which won't get precompiled with the containing method.