GDL is used at run time in 4 crates (of which 2 optionally, 3 directly). It's used only as a dev dependency in 1 crate.

Depender (with downloads and own rev deps) GDL version
1 subgraph-matching ^0.2.4
1 graph_builder optional ^0.2.6
assert-graph-iso optional ^0.2.4