gotgraph 0.2.0

A type-safe, scope-aware graph library that leverages Rust's type system to prevent common graph-related bugs at compile time
Documentation 
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error: lifetime may not live long enough
 --> tests/compile_fail/wrong_graph_edge_operation.rs:9:9
  |
8 |     let node1 = graph1.scope_mut(|mut ctx| {
  |                                   -------- return type of closure is NodeTag<'2, NodeIx>
  |                                   |
  |                                   has type `gotgraph::graph::Context<'1, &mut gotgraph::vec_graph::VecGraph<i32, &str>>`
9 |         ctx.add_node(1)
  |         ^^^^^^^^^^^^^^^ returning this value requires that `'1` must outlive `'2`
  |
  = note: requirement occurs because of the type `NodeTag<'_, NodeIx>`, which makes the generic argument `'_` invariant
  = note: the struct `NodeTag<'scope, I>` is invariant over the parameter `'scope`
  = help: see <https://doc.rust-lang.org/nomicon/subtyping.html> for more information about variance

error: lifetime may not live long enough
  --> tests/compile_fail/wrong_graph_edge_operation.rs:13:9
   |
12 |     let node2 = graph2.scope_mut(|mut ctx| {
   |                                   -------- return type of closure is NodeTag<'2, NodeIx>
   |                                   |
   |                                   has type `gotgraph::graph::Context<'1, &mut gotgraph::vec_graph::VecGraph<i32, &str>>`
13 |         ctx.add_node(2)
   |         ^^^^^^^^^^^^^^^ returning this value requires that `'1` must outlive `'2`
   |
   = note: requirement occurs because of the type `NodeTag<'_, NodeIx>`, which makes the generic argument `'_` invariant
   = note: the struct `NodeTag<'scope, I>` is invariant over the parameter `'scope`
   = help: see <https://doc.rust-lang.org/nomicon/subtyping.html> for more information about variance

error[E0521]: borrowed data escapes outside of closure
  --> tests/compile_fail/wrong_graph_edge_operation.rs:19:9
   |
 8 |     let node1 = graph1.scope_mut(|mut ctx| {
   |         ----- `node1` declared here, outside of the closure body
...
17 |     graph1.scope_mut(|mut ctx| {
   |                       ------- `ctx` is a reference that is only valid in the closure body
18 |         // ERROR: node2 belongs to different graph/scope
19 |         ctx.add_edge("invalid", node1, node2);
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `ctx` escapes the closure body here
   |
   = note: requirement occurs because of the type `NodeTag<'_, NodeIx>`, which makes the generic argument `'_` invariant
   = note: the struct `NodeTag<'scope, I>` is invariant over the parameter `'scope`
   = help: see <https://doc.rust-lang.org/nomicon/subtyping.html> for more information about variance