report specifies a missing range where separate lines are expected

[altendky]

Describe the bug

coverage report shows unexpected range including covered and excluded lines

To Reproduce

$ rm -rf venv .coverage

$ python3.11 -m venv venv

$ venv/bin/python --version --version
Python 3.11.2 (main, Mar  5 2023, 21:14:41) [GCC 11.3.0]

$ venv/bin/python -m pip install git+https://github.com/nedbat/coveragepy@a3d915e6a5552dcc96601dd7ee75db809e364e33
Collecting git+https://github.com/nedbat/coveragepy@a3d915e6a5552dcc96601dd7ee75db809e364e33
  Cloning https://github.com/nedbat/coveragepy (to revision a3d915e6a5552dcc96601dd7ee75db809e364e33) to /tmp/pip-req-build-5mtjtvaa
  Running command git clone --filter=blob:none --quiet https://github.com/nedbat/coveragepy /tmp/pip-req-build-5mtjtvaa
  Running command git rev-parse -q --verify 'sha^a3d915e6a5552dcc96601dd7ee75db809e364e33'
  Running command git fetch -q https://github.com/nedbat/coveragepy a3d915e6a5552dcc96601dd7ee75db809e364e33
  Resolved https://github.com/nedbat/coveragepy to commit a3d915e6a5552dcc96601dd7ee75db809e364e33
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
  Installing backend dependencies ... done
  Preparing metadata (pyproject.toml) ... done
Building wheels for collected packages: coverage
  Building wheel for coverage (pyproject.toml) ... done
  Created wheel for coverage: filename=coverage-7.3.3a0.dev1-cp311-cp311-linux_x86_64.whl size=230523 sha256=7716fa9e6bafbb85946bd0d3313513e302c009ddb7a40383213492bb41f99db7
  Stored in directory: /home/altendky/.cache/pip/wheels/92/f7/bb/de3a599f4d9666983fb530d6fab1e8576ed43bafa869c2c58f
Successfully built coverage
Installing collected packages: coverage
Successfully installed coverage-7.3.3a0.dev1

[notice] A new release of pip available: 22.3.1 -> 23.3
[notice] To update, run: /home/altendky/tmp/venv/bin/python -m pip install --upgrade pip

$ venv/bin/python -m pip freeze --all
coverage @ git+https://github.com/nedbat/coveragepy@a3d915e6a5552dcc96601dd7ee75db809e364e33
pip==22.3.1
setuptools==65.5.0

$ cat --number x.py
     1  from __future__ import annotations
     2
     3
     4  def a(first_fixture_name: FixtureType) -> None:
     5      print()
     6
     7  def b(
     8      first_fixture_name: FixtureType,
     9  ) -> None:
    10      print()
    11
    12  def c(another_fixture_name: FixtureType) -> None:  # pragma: no cover
    13      print()
    14
    15  def d(
    16      another_fixture_name: FixtureType,  # pragma: no cover
    17  ) -> None:
    18      print()
    19
    20  print("the end")

$ cat .coveragerc
[report]
exclude_also =
  first_fixture_name[^)]*\)[^:]*:

$ venv/bin/python x.py
the end

$ venv/bin/coverage run --rcfile .coveragerc x.py
the end

$ venv/bin/coverage report --rcfile .coveragerc --show-missing
Name    Stmts   Miss  Cover   Missing
-------------------------------------
x.py        5      2    60%   10-18
-------------------------------------
TOTAL       5      2    60%

$ venv/bin/coverage json --rcfile .coveragerc --pretty-print -o -
{
    "meta": {
        "version": "7.3.3a0.dev1",
        "timestamp": "2023-10-18T08:25:04.198309",
        "branch_coverage": false,
        "show_contexts": false
    },
    "files": {
        "x.py": {
            "executed_lines": [
                1,
                4,
                7,
                12,
                15,
                20
            ],
            "summary": {
                "covered_lines": 3,
                "num_statements": 5,
                "percent_covered": 60.0,
                "percent_covered_display": "60",
                "missing_lines": 2,
                "excluded_lines": 5
            },
            "missing_lines": [
                10,
                18
            ],
            "excluded_lines": [
                4,
                5,
                12,
                13,
                15
            ]
        }
    },
    "totals": {
        "covered_lines": 3,
        "num_statements": 5,
        "percent_covered": 60.0,
        "percent_covered_display": "60",
        "missing_lines": 2,
        "excluded_lines": 5
    }
}

$ venv/bin/coverage debug sys
-- sys -------------------------------------------------------
               coverage_version: 7.3.3a0.dev1
                coverage_module: /home/altendky/tmp/venv/lib/python3.11/site-packages/coverage/__init__.py
                         tracer: -none-
                        CTracer: available
           plugins.file_tracers: -none-
            plugins.configurers: -none-
      plugins.context_switchers: -none-
              configs_attempted: .coveragerc
                   configs_read: /home/altendky/tmp/.coveragerc
                    config_file: /home/altendky/tmp/.coveragerc
                config_contents: b'[report]\nexclude_also =\n  first_fixture_name[^)]*\\)[^:]*:\n'
                      data_file: -none-
                         python: 3.11.2 (main, Mar  5 2023, 21:14:41) [GCC 11.3.0]
                       platform: Linux-6.2.0-34-generic-x86_64-with-glibc2.35
                 implementation: CPython
                     executable: /home/altendky/tmp/venv/bin/python
                   def_encoding: utf-8
                    fs_encoding: utf-8
                            pid: 9733
                            cwd: /home/altendky/tmp
                           path: /home/altendky/tmp/venv/bin
                                 /home/altendky/.pyenv/versions/3.11.2/lib/python311.zip
                                 /home/altendky/.pyenv/versions/3.11.2/lib/python3.11
                                 /home/altendky/.pyenv/versions/3.11.2/lib/python3.11/lib-dynload
                                 /home/altendky/tmp/venv/lib/python3.11/site-packages
                    environment: HOME = /home/altendky
                                 PYENV_ROOT = /home/altendky/.pyenv
                                 PYTHONDONTWRITEBYTECODE = 1
                                 PYTHON_CONFIGURE_OPTS = --enable-shared
                   command_line: venv/bin/coverage debug sys
         sqlite3_sqlite_version: 3.37.2
             sqlite3_temp_store: 0
        sqlite3_compile_options: ATOMIC_INTRINSICS=1, COMPILER=gcc-11.3.0, DEFAULT_AUTOVACUUM,
                                 DEFAULT_CACHE_SIZE=-2000, DEFAULT_FILE_FORMAT=4,
                                 DEFAULT_JOURNAL_SIZE_LIMIT=-1, DEFAULT_MMAP_SIZE=0, DEFAULT_PAGE_SIZE=4096,
                                 DEFAULT_PCACHE_INITSZ=20, DEFAULT_RECURSIVE_TRIGGERS,
                                 DEFAULT_SECTOR_SIZE=4096, DEFAULT_SYNCHRONOUS=2,
                                 DEFAULT_WAL_AUTOCHECKPOINT=1000, DEFAULT_WAL_SYNCHRONOUS=2,
                                 DEFAULT_WORKER_THREADS=0, ENABLE_COLUMN_METADATA, ENABLE_DBSTAT_VTAB,
                                 ENABLE_FTS3, ENABLE_FTS3_PARENTHESIS, ENABLE_FTS3_TOKENIZER, ENABLE_FTS4,
                                 ENABLE_FTS5, ENABLE_JSON1, ENABLE_LOAD_EXTENSION, ENABLE_MATH_FUNCTIONS,
                                 ENABLE_PREUPDATE_HOOK, ENABLE_RTREE, ENABLE_SESSION, ENABLE_STMTVTAB,
                                 ENABLE_UNLOCK_NOTIFY, ENABLE_UPDATE_DELETE_LIMIT, HAVE_ISNAN,
                                 LIKE_DOESNT_MATCH_BLOBS, MALLOC_SOFT_LIMIT=1024, MAX_ATTACHED=10,
                                 MAX_COLUMN=2000, MAX_COMPOUND_SELECT=500, MAX_DEFAULT_PAGE_SIZE=32768,
                                 MAX_EXPR_DEPTH=1000, MAX_FUNCTION_ARG=127, MAX_LENGTH=1000000000,
                                 MAX_LIKE_PATTERN_LENGTH=50000, MAX_MMAP_SIZE=0x7fff0000,
                                 MAX_PAGE_COUNT=1073741823, MAX_PAGE_SIZE=65536, MAX_SCHEMA_RETRY=25,
                                 MAX_SQL_LENGTH=1000000000, MAX_TRIGGER_DEPTH=1000,
                                 MAX_VARIABLE_NUMBER=250000, MAX_VDBE_OP=250000000, MAX_WORKER_THREADS=8,
                                 MUTEX_PTHREADS, OMIT_LOOKASIDE, SECURE_DELETE, SOUNDEX, SYSTEM_MALLOC,
                                 TEMP_STORE=1, THREADSAFE=1, USE_URI

Expected behavior

The report output would be the separate lines 10, 18 not the range 10-18.

Additional context

The big picture is that I am exploring ways to easily exclude all tests using a certain fixture since they are run separately without coverage measurement. This was an observation along the way.

[nedbat]

This does look odd, and I guess could be improved. The logic is that between lines 10 and 18, there are no lines that could be executed that were executed, so the range is expressed as 10-18. This is so that comments and blank lines won't interrupt a range. Perhaps excluded lines should be considered differently.