Module panic 

Go panics, carried on Rust unwinding.

A Go panic becomes a Rust unwind whose payload is a GoPanic. Runtime errors (division by zero, bounds, nil dereference, …) use the same payload with gc’s exact text, because programs and tests match on it.

For now the payload holds only the text gc prints after panic: . From M1, when interfaces exist, it carries the panic value as an any, so recover can hand it back and runtime errors satisfy runtime.Error.

Structs

GoPanic

Payload of a Rust unwind that implements a Go panic: the value recover hands back, and the text gc prints after panic: .

Enums

RuntimeError

The runtime errors generated code can raise.

Functions

begin

Takes over a caught panic so the deferred calls can recover it.

go_panic

Starts a Go panic.

init_runtime_errors

Teaches the runtime the ids of Error() string and String() string, so a recovered runtime error satisfies error like gc’s does. Generated main calls this before anything else.

panic_custom

panic(v) for a value of a named type with a predeclared underlying type, printed as gc’s printanycustomtype does: main.T(5), main.S("x").

panic_iface

panic(v) where the value is an interface: its type descriptor knows how gc prints it (an error prints Error(), a named basic type prints main.T(v), and so on).

panic_nil

panic(nil).

panic_value

panic(v) for a value of a predeclared type, printed as gc’s printpanicval does: like print, with newlines in strings followed by a tab.

recover

recover(): the value of the panic being handled, and an end to it.

recovered

Whether the panic being handled was recovered.

resume

Carries on unwinding with the panic being handled.

runtime_error

Raises a Go runtime error.