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Implement interpolated strings via String.Concat #19971

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Merged
T-Gro merged 17 commits into from
Aug 1, 2026
Merged

Implement interpolated strings via String.Concat #19971

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f571df9
Lower string-typed interpolation to String.Concat (reflection-free)
charlesroddie Jun 18, 2026
423d007
Add release notes for interpolated string String.Concat lowering
charlesroddie Jun 18, 2026
c7beb02
tidy
charlesroddie Jun 19, 2026
1951198
Lower string interpolation by type-checking each part in place
charlesroddie Jun 20, 2026
3d5bb3d
cleanup
charlesroddie Jun 20, 2026
5eae16c
Pass a bare %s through as a string instead of via sprintf
charlesroddie Jun 20, 2026
b278961
%s is AOT compatible now
charlesroddie Jun 20, 2026
e83ddfb
Type-check formatted interpolation holes only once
charlesroddie Jun 20, 2026
6112fd2
Lower bare %c/%d/%i/%M interpolation holes to String.Concat
charlesroddie Jun 20, 2026
7d2a246
Check NativeAOT interpolated-string output against expected values
charlesroddie Jun 22, 2026
e87b12f
Add EmittedIL tests for interpolation cases not optimized before
charlesroddie Jun 22, 2026
42e84bb
Merge remote-tracking branch 'upstream/main' into InterpolatedStringC…
charlesroddie Jul 30, 2026
c36ae55
Use the shared mkStringConcat helper for interpolation lowering
charlesroddie Jul 30, 2026
930d2ad
Keep parens around a dangling hole with an alignment
charlesroddie Jul 30, 2026
7163857
Accept a nullable string in a '%s' interpolation hole
charlesroddie Jul 30, 2026
55d2c6b
Format ParseHelpers.fs
charlesroddie Jul 30, 2026
df0ef58
Update expected trimmed sizes for the interpolation codegen change
charlesroddie Jul 30, 2026
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Update expected trimmed sizes for the interpolation codegen change 
Both apps statically link FSharp.Compiler.Service, so the added lowering code
shifts them by one 512-byte alignment unit. CI reported both values.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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@charlesroddie @claude
charlesroddie and claude committed Jul 30, 2026
commit df0ef5847ec8f8a2e620d62d070656a9b0683004
4 changes: 2 additions & 2 deletions tests/AheadOfTime/Trimming/check.ps1
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Expand Up @@ -68,10 +68,10 @@ $allErrors += CheckTrim -root "SelfContained_Trimming_Test" -tfm "net9.0" -outpu
# Check net9.0 trimmed assemblies with static linked FSharpCore.
# Statically links FSharp.Compiler.Service; the size is stable now that its codegen is
# deterministic (#19928/#19929). Update if compiler/trimming output intentionally changes.
$allErrors += CheckTrim -root "StaticLinkedFSharpCore_Trimming_Test" -tfm "net9.0" -outputfile "StaticLinkedFSharpCore_Trimming_Test.dll" -expected_len 9173504 -callerLineNumber 71
$allErrors += CheckTrim -root "StaticLinkedFSharpCore_Trimming_Test" -tfm "net9.0" -outputfile "StaticLinkedFSharpCore_Trimming_Test.dll" -expected_len 9174016 -callerLineNumber 71

# Check net9.0 trimmed assemblies with F# metadata resources removed
$allErrors += CheckTrim -root "FSharpMetadataResource_Trimming_Test" -tfm "net9.0" -outputfile "FSharpMetadataResource_Trimming_Test.dll" -expected_len 7612928 -callerLineNumber 74
$allErrors += CheckTrim -root "FSharpMetadataResource_Trimming_Test" -tfm "net9.0" -outputfile "FSharpMetadataResource_Trimming_Test.dll" -expected_len 7613440 -callerLineNumber 74

# Report all errors and exit with failure if any occurred
if ($allErrors.Count -gt 0) {
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