add support for erf

[rcalxrc08]

solves #48

[mBarreau]

You need to add the dependency in the folder benchmark as well.

[mBarreau]

The manifest file must be added as well.

[rcalxrc08]

Why don't you instantiate the package? Usually you don't commit the Manifest file.
Anyway I don't have julia 1.9.0, my manifest for the benchmarks is quite different from the commited one.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.05% 🎉

Comparison is base (41c99f4) 86.25% compared to head (2842515) 86.30%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
+ Coverage   86.25%   86.30%   +0.05%     
==========================================
  Files           6        6              
  Lines         240      241       +1     
==========================================
+ Hits          207      208       +1     
  Misses         33       33              

Files Changed	Coverage Δ
src/codegen.jl	100.00% <100.00%> (ø)

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[tansongchen]

The reason for committing Manifest.toml to this repo is that we want exactly the same version of dependency packages on each benchmark run, so that we can make sure the time difference from run to run is caused by a change of our performance, not others. Looks good, will merge