XO1510: a function disagrees with this build's definitions

Before code generation the native backends check every call, closure, and field or payload access against this build’s definitions. A mismatch means a piece of the build came from a cache built under other definitions (a front end body that names a helper by a name this build gives another helper, gotchas/helper-name-creation-order.md): emitting the call would produce a binary that faults. The build stops instead. It is a compiler bug, not an error in the program.

Example

# XO1510: http.fields_in: b27: v117: Str? = call xo.maph.logget[Map[Str, Str]] ...: result type does not match the callee

Fix

# rebuild without the backend cache and report the message
XO_BACKEND_CACHE=off xo build .

Run xo explain XO1510 for this text in a terminal, or see section 10.6 of the specification.