Fuel-based inlining does reached max-inlines limit earlier then expected

[WojciechMazur]

Based on the OpenCB failure in armanbilge/gcp4s (using circe/circe codecs derivation)

On 3.9.rc under -Xmax-lines 64 the following example was able to go through 63 iterations - that's the expected behaviour. Now, with fuel-based approach it fails during 49 nested invocation. It suggest the current tracking of inlines might be flowed, resulting in pre-mature failure. It might affect all ecosystem, forcing raising the max-lines limits in multiple projects

Compiler version

Last good release: 3.10.0-RC1-bin-20260813-afdb1e2-NIGHTLY
First bad release: 3.10.0-RC1-bin-20260816-3adfcbd-NIGHTLY

Bisect points to a4e1b44 / #25937

Minimized code

//> using options -Xmax-inlines 64

import scala.compiletime.{constValue, erasedValue}

inline def summonLabels[T <: Tuple]: List[String] =
  inline erasedValue[T] match
    case _: EmptyTuple => Nil
    case _: (t *: ts) => constValue[t].asInstanceOf[String] :: summonLabels[ts]

// Minimal 3.10 failure: first size over the new inline recursion limit.
val xs49: List[String] = summonLabels[(
  "f00", "f01", "f02", "f03", "f04", "f05", "f06", "f07", "f08", "f09",
  "f10", "f11", "f12", "f13", "f14", "f15", "f16", "f17", "f18", "f19",
  "f20", "f21", "f22", "f23", "f24", "f25", "f26", "f27", "f28", "f29",
  "f30", "f31", "f32", "f33", "f34", "f35", "f36", "f37", "f38", "f39",
  "f40", "f41", "f42", "f43", "f44", "f45", "f46", "f47", "f48"
)]

// Expected: last size that compiled on 3.9.0-RC6 with -Xmax-inlines 64.
val xs63: List[String] = summonLabels[(
  "f00", "f01", "f02", "f03", "f04", "f05", "f06", "f07", "f08", "f09",
  "f10", "f11", "f12", "f13", "f14", "f15", "f16", "f17", "f18", "f19",
  "f20", "f21", "f22", "f23", "f24", "f25", "f26", "f27", "f28", "f29",
  "f30", "f31", "f32", "f33", "f34", "f35", "f36", "f37", "f38", "f39",
  "f40", "f41", "f42", "f43", "f44", "f45", "f46", "f47", "f48", "f49",
  "f50", "f51", "f52", "f53", "f54", "f55", "f56", "f57", "f58", "f59",
  "f60", "f61", "f62"
)]

Output

-- Error: /Users/wmazur/projects/scala/community-build3/repro/armanbilge/gcp4s/test.scala:24:35 
24 |val xs: List[String] = summonLabels[(
   |                       ^
   |Recursion limit exceeded.
   |Maybe there is an illegal cyclic reference?
   |If that's not the case, you could try to increase the fuel and stack size: https://docs.scala-lang.org/overviews/compiler-options/compiling-deeply-nested-code.html
   |For the unprocessed stack overflow trace, compile with -Xno-enrich-error-messages.
   |A recurring operation is (inner to outer):
   |
   |  typing summonLabels[EmptyTuple.type]
   |  typing summonLabels[EmptyTuple.type].::
   |  typing summonLabels[EmptyTuple.type].::[String]

Expectation