mypy --any-exprs-report depends on formatting

[SoloJacobs]

Bug Report

The report any-exprs.txt generated by mypy --any-exprs-report changes its output, even if the AST has not changed in any way.

To Reproduce

This is a minimal example:

Error = (
    int
    | int
)

mypy reports

 Name   Anys   Exprs   Coverage
-------------------------------
    t      2       4     50.00%
-------------------------------
Total      2       4     50.00%

On the other hand, this example produces no errors

OK = int | int

Again the table, for completeness.

 Name   Anys   Exprs   Coverage
-------------------------------
    s      0       2    100.00%
-------------------------------
Total      0       2    100.00%

The underlying reason is that mypy counts expressions set as TYPE_UNANALYZED as Anys expression. This is very surprising to me. The specific expression is assigned TYPE_UNANALYZED in StatisticsVisitor.type.

Expected Behavior

The invocation mypy --any-exprs-report matches the number of errors encountered by running mypy --disallow-any-exprs. Or at the very least clear up the documentation:

Causes mypy to generate a text file report documenting how many
    expressions of type ``Any`` are present within your codebase.

Your Environment

I don't think this matters, but:

• Mypy version used:
  mypy 1.14.0 (compiled: yes)
  mypy 1.15.0+dev.d79d89e3ff31ed67a41b0663da9ec8e037d41fa0 (compiled: no)
• Mypy command-line flags: --any-exprs-report
• Mypy configuration options from mypy.ini (and other config files): None
• Python version used: 3.12.1