Improve well formed check for shading functions

7 jobs for shading_function_check in 4 minutes and 35 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #7296262
build

00:04:35

passed #7296267
build_android

00:01:20

passed #7296263
build_clang_libcpp

00:04:12

passed #7296266
build_clazy

00:03:21

passed #7296265
build_mingw64_fedora

00:02:27

passed #7296264
build_ubuntu_16_04

00:03:03

passed #7296261
clang_format

00:01:59