three.js - Why do I get "undeclared identifier" when I declared the identifier in a shader.replace function? - Stack Overflow
ios - Error: Use of undeclared identifier 'SSL_get_secure_renegotiation_support'; did you mean 'GRPC_SHADOW_SSL_get_secure_renegotiation_support'? - Stack Overflow
c++ - gets() is causing compilation failure with ''use of undeclared identifier 'gets'" error - Stack Overflow
swift - "Use of undeclared identifier '__BYTE_ORDER' " error after updating pod - Stack Overflow
Use of undeclared identifier 'OWSLegacyContactDiscoveryOperation' · Issue #4135 · signalapp/Signal-iOS · GitHub
pset1 - I keep getting error: use of undeclared identifier 'n' when trying to compile mario.c. I am new to coding, my code is shown below - CS50 Stack Exchange
ios - Use of undeclared identifier in my CocoaPod - Stack Overflow
Build errors on FreeBSD: error: use of undeclared identifier 'INFINITY', 'NAN', etc · Issue #1473 · open62541/open62541 · GitHub
c - Use of undeclared identifier 'ENOMEM' - Stack Overflow
objective c - Use of undeclared identifier for "nil" - Stack Overflow
Serial" is not recognized and is considered as an "Undeclared Identifier" · Issue #159 · arduino/arduino-ide · GitHub