Skip to content

adapt generic matches to inheritance penalty of final objects #24691

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 3 commits into from
Feb 19, 2025
Merged
Changes from all commits
Commits
File filter

Filter by extension

Filter by extension

Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
10 changes: 8 additions & 2 deletions compiler/sigmatch.nim
Original file line number Diff line number Diff line change
Expand Up @@ -1692,7 +1692,8 @@ proc typeRel(c: var TCandidate, f, aOrig: PType,
if aAsObject.kind == tyObject and trIsOutParam notin flags:
let baseType = aAsObject.base
if baseType != nil:
inc c.inheritancePenalty, 1 + int(c.inheritancePenalty < 0)
if tfFinal notin aAsObject.flags:
inc c.inheritancePenalty, 1 + int(c.inheritancePenalty < 0)
let ret = typeRel(c, f, baseType, flags)
return if ret in {isEqual,isGeneric}: isSubtype else: ret

Expand Down Expand Up @@ -1733,6 +1734,10 @@ proc typeRel(c: var TCandidate, f, aOrig: PType,
let tr = typeRel(c, f[i], x[i], flags)
if tr <= isSubtype: return
result = isGeneric
let impl = last(f[0])
if impl.kind == tyObject and tfFinal notin impl.flags:
# match non-invocation case
inc c.inheritancePenalty, 0 + int(c.inheritancePenalty < 0)
elif x.kind == tyGenericInst and f[0] == x[0] and
x.len - 1 == f.len:
for i in 1..<f.len:
Expand Down Expand Up @@ -1789,7 +1794,8 @@ proc typeRel(c: var TCandidate, f, aOrig: PType,
depth = -1

if depth >= 0:
inc c.inheritancePenalty, depth + int(c.inheritancePenalty < 0)
if aobj.kind == tyObject and tfFinal notin aobj.flags:
inc c.inheritancePenalty, depth + int(c.inheritancePenalty < 0)
# bug #4863: We still need to bind generic alias crap, so
# we cannot return immediately:
result = if depth == 0: isGeneric else: isSubtype
Expand Down