[VECTORFLOW-COMPILE] Non-release build.
src/vectorflow/layers.d(174,16): Error: `@safe` function `vectorflow.layers.Linear.serialize` cannot call `@system` function `vectorflow.serde.Serializer.write!ulong.write`
src/vectorflow/serde.d(33,10):        `vectorflow.serde.Serializer.write!ulong.write` is declared here
src/vectorflow/layers.d(175,16): Error: `@safe` function `vectorflow.layers.Linear.serialize` cannot call `@system` function `vectorflow.serde.Serializer.write!ulong.write`
src/vectorflow/serde.d(33,10):        `vectorflow.serde.Serializer.write!ulong.write` is declared here
src/vectorflow/layers.d(177,24): Error: `@safe` function `vectorflow.layers.Linear.serialize` cannot call `@system` function `vectorflow.serde.Serializer.write_vec!(float[]).write_vec`
src/vectorflow/serde.d(72,10):        `vectorflow.serde.Serializer.write_vec!(float[]).write_vec` is declared here
src/vectorflow/layers.d(182,39): Error: `@safe` function `vectorflow.layers.Linear.deserialize` cannot call `@system` function `vectorflow.serde.Serializer.read!ulong.read`
src/vectorflow/serde.d(52,13):        `vectorflow.serde.Serializer.read!ulong.read` is declared here
src/vectorflow/layers.d(183,32): Error: `@safe` function `vectorflow.layers.Linear.deserialize` cannot call `@system` function `vectorflow.serde.Serializer.read!ulong.read`
src/vectorflow/serde.d(52,13):        `vectorflow.serde.Serializer.read!ulong.read` is declared here
src/vectorflow/layers.d(185,36): Error: `@safe` function `vectorflow.layers.Linear.deserialize` cannot call `@system` function `vectorflow.serde.Serializer.read_vec!float.read_vec`
src/vectorflow/serde.d(79,9):        `vectorflow.serde.Serializer.read_vec!float.read_vec` is declared here
src/vectorflow/layers.d(408,16): Error: `@safe` function `vectorflow.layers.DropOut.serialize` cannot call `@system` function `vectorflow.serde.Serializer.write!float.write`
src/vectorflow/serde.d(33,10):        `vectorflow.serde.Serializer.write!float.write` is declared here
src/vectorflow/layers.d(413,34): Error: `@safe` function `vectorflow.layers.DropOut.deserialize` cannot call `@system` function `vectorflow.serde.Serializer.read!float.read`
src/vectorflow/serde.d(52,13):        `vectorflow.serde.Serializer.read!float.read` is declared here
src/vectorflow/layers.d(757,21): Error: `@safe` function `vectorflow.layers.SparseKernelExpander.predict` cannot call `@system` function `std.variant.VariantN!32LU.VariantN.convertsTo!(SparseFG[]).convertsTo`
/opt/dmd-safe/dmd/generated/linux/release/64/../../../../../phobos/std/variant.d(808,20):        `std.variant.VariantN!32LU.VariantN.convertsTo!(SparseFG[]).convertsTo` is declared here
src/vectorflow/layers.d(762,27): Error: `@safe` function `vectorflow.layers.SparseKernelExpander.predict` cannot call `@system` function `std.variant.VariantN!32LU.VariantN.get!(SparseFG[]).get`
/opt/dmd-safe/dmd/generated/linux/release/64/../../../../../phobos/std/variant.d(825,24):        `std.variant.VariantN!32LU.VariantN.get!(SparseFG[]).get` is declared here
src/vectorflow/layers.d(842,16): Error: `@safe` function `vectorflow.layers.SparseKernelExpander.serialize` cannot call `@system` function `vectorflow.serde.Serializer.write!uint.write`
src/vectorflow/serde.d(33,10):        `vectorflow.serde.Serializer.write!uint.write` is declared here
src/vectorflow/layers.d(843,16): Error: `@safe` function `vectorflow.layers.SparseKernelExpander.serialize` cannot call `@system` function `vectorflow.serde.Serializer.write!uint.write`
src/vectorflow/serde.d(33,10):        `vectorflow.serde.Serializer.write!uint.write` is declared here
src/vectorflow/layers.d(848,44): Error: `@safe` function `vectorflow.layers.SparseKernelExpander.deserialize` cannot call `@system` function `vectorflow.serde.Serializer.read!string.read`
src/vectorflow/serde.d(52,13):        `vectorflow.serde.Serializer.read!string.read` is declared here
src/vectorflow/layers.d(849,36): Error: `@safe` function `vectorflow.layers.SparseKernelExpander.deserialize` cannot call `@system` function `vectorflow.serde.Serializer.read!uint.read`
src/vectorflow/serde.d(52,13):        `vectorflow.serde.Serializer.read!uint.read` is declared here
src/vectorflow/layers.d(850,44): Error: `@safe` function `vectorflow.layers.SparseKernelExpander.deserialize` cannot call `@system` function `vectorflow.serde.Serializer.read!uint.read`
src/vectorflow/serde.d(52,13):        `vectorflow.serde.Serializer.read!uint.read` is declared here
src/vectorflow/layers.d(883,25): Error: `@safe` function `vectorflow.layers.Data!(cast(LayerT)0).Data.predict` cannot call `@system` function `std.variant.VariantN!32LU.VariantN.convertsTo!(float[]).convertsTo`
/opt/dmd-safe/dmd/generated/linux/release/64/../../../../../phobos/std/variant.d(808,20):        `std.variant.VariantN!32LU.VariantN.convertsTo!(float[]).convertsTo` is declared here
src/vectorflow/layers.d(887,26): Error: `@safe` function `vectorflow.layers.Data!(cast(LayerT)0).Data.predict` cannot call `@system` function `std.variant.VariantN!32LU.VariantN.get!(float[]).get`
/opt/dmd-safe/dmd/generated/linux/release/64/../../../../../phobos/std/variant.d(825,24):        `std.variant.VariantN!32LU.VariantN.get!(float[]).get` is declared here
src/vectorflow/layers.d(921,19): Error: template instance `vectorflow.layers.Data!(cast(LayerT)0)` error instantiating
src/vectorflow/layers.d(891,25): Error: `@safe` function `vectorflow.layers.Data!(cast(LayerT)1).Data.predict` cannot call `@system` function `std.variant.VariantN!32LU.VariantN.convertsTo!(SparseF[]).convertsTo`
/opt/dmd-safe/dmd/generated/linux/release/64/../../../../../phobos/std/variant.d(808,20):        `std.variant.VariantN!32LU.VariantN.convertsTo!(SparseF[]).convertsTo` is declared here
src/vectorflow/layers.d(895,26): Error: `@safe` function `vectorflow.layers.Data!(cast(LayerT)1).Data.predict` cannot call `@system` function `std.variant.VariantN!32LU.VariantN.get!(SparseF[]).get`
/opt/dmd-safe/dmd/dmd-safe failed with exit code 1.