Imprecision in compiler.rst

[psyker156]

When adding a new opcode, if the guide is followed as is, the following error will be emitted as regen-importlib expects the new opcode target to be present in ceval.c before the command is added.

gcc -pthread -c -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -std=c99 -Wextra -Wno-unused-result -Wno-unused-parameter -Wno-missing-field-initializers -Werror=implicit-function-declaration -I. -I./Include -DPy_BUILD_CORE -o Python/ceval.o Python/ceval.c In file included from Python/ceval.c:629:0: Python/ceval.c: In function ‘_PyEval_EvalFrameDefault’: Python/opcode_targets.h:119:5: error: label ‘TARGET_LOAD_BUILTIN’ used but not defined &&TARGET_LOAD_BUILTIN, ^ Makefile:1613: recipe for target 'Python/ceval.o' failed make: *** [Python/ceval.o] Error 1

I have already created a pull request for this. Please see #416

[Mariatta]

GitMate.io thinks possibly related issues are #181 (A couple of issues with compiler.rst), #199 (Improve "Commit Messages" section in committing.rst), #170 (Who is BCP at developers.rst), #44 (Update committing.rst for Git/GitHub), and #50 (Update index.rst for Git/GitHub).