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tests/lint: reorganize tests Tests for a single working language construct don't usually need a separate file, they can be grouped together, like in expr.c or gcc.c.
lint: warn about function definitions without header declaration The existing warning was only issued for function declarations, not for function definitions. The interesting change in the tests is in msg_351.c. Many other tests use non-static functions due to their syntactic brevity. In these tests, the warning is disabled individually, to allow new functions to be added without generating warning 351.
lint: add quotes around placeholders for the remaining messages Reword some of the messages slightly, exchanging brevity for clarity. Message 138 is kept as-is, as it is not yet covered by any tests. Message 240 is kep as-is, as it is unreachable.
tests/lint: expect complete messages in feature tests Previously, the tests contained many comments like /* expect: 123 */, which were useless to a casual reader since nobody is expected to learn lint's message IDs by heart. Replace these with the complete diagnostics, to show what lint is complaining about. The tests named msg_*.c have been left unmodified since they mention the full message text in their header comment. No functional change.
lint: force each test to declare the expected diagnostics By listing the expected diagnostics directly at the code that triggers the diagnostics, it is easier to cross-check whether the diagnostics make sense. No functional change to lint itself.
lint: add common header for all tests For those tests that didn't use GCC-style line markers such as "# 2", the line numbers of the diagnostics stay the same. This is purely conincidental. Before, the 3 lines came from lint's built-in definitions (see 'builtins' in main1.c), and line number counting continued as if nothing had happened, making the first line of the actual file line 4. These 3 built-in lines are now replaced with 3 lines of file header.
lint: fix segmentation fault when checking returned enum types (211)