Read access and mutable borrows diagrams

Read access and mutable borrows

Start with how the application begins, then follow data between its folders. Open an operation to see its decisions, calls, failures and cleanup. Its explanation supplies the exact contract and linked dependencies.

This view includes 2 application source files. Package and interface boundaries show checked contracts; their runtime implementations are not expanded. The views describe the checked program, not desired requirements or a recorded execution.

Where execution begins

Startup

It creates Counter with value 1 and stores the result in owned counter (Counter). It calls counter.increment. It prints counter.read. source

Data flow

100%

Mermaid source

flowchart TD
    n0["counter"]
    n1["Startup"]
    n1 -->|"Counter(value) / Counter.increment + 1 more → Counter / int"| n0

Follow the data

Each row opens the complete operations and call sites behind one pair of logical units. A grouped arrow records calls between those units; connected arrows need not belong to the same execution path.

From	To	Operations	Read
Startup	counter	3	Inputs, results and call sites

Data crossing these boundaries (3 contracts)

Startup → counter

3 operations, 3 sites

Counter

Inputs: value: int. Result: Counter.

Caller or entry	Evidence
Startup	Call site · Caller explanation

Counter.increment

No caller-supplied inputs. Result: void.

Caller or entry	Evidence
Startup	Call site · Caller explanation

Counter.read

No caller-supplied inputs. Result: int.

Caller or entry	Evidence
Startup	Call site · Caller explanation

Open a module

Module	Read
counter.aug	Flow and sequences · Explanation
main.aug	Flow and sequences · Explanation

These are static call boundaries, not a request trace. Interface implementations and foreign internals stop at their checked contracts. Dotted arrows defer a callback or browser action. Imports alone do not imply a call.