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Fix lost source range for empty-bodied computation expressions in pipelines (#19550) - #19849
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…elines (#19550) - Pass mExprAndArg (full App range) instead of mLeftExpr as mWhole to TcComputationExpression so that the synthesized Zero() call has a meaningful range when the CE body is empty. - Fall back to ceenv.mWhole inside the SynExpr.ImplicitZero translation when the incoming range is range0, defensively preventing zero-ranged synthesized calls from reaching codegen / diagnostics. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Adds the CE_PipelineRange19550 test file (registered in the ComponentTests fsproj) and a release-notes bullet in 11.0.100.md. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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❗ Release notes requiredYou can open this PR in browser to add release notes: open in github.dev
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T-Gro
enabled auto-merge (squash)
June 2, 2026 10:37
…50 tests The test names are self-documenting. Removed 151 lines of noise: - Massive module-level doc comment explaining sprint plans - // ---- block separator lines between every test - Per-test essays about current/expected behavior Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
abonie
approved these changes
Jun 11, 2026
abonie
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Jun 23, 2026
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Summary
Fixes#19550
When a computation expression with an empty body (e.g.
foo {}) is used in a pipeline, the synthesizedZero()call was givenrange0(i.e.unknown(1,1)) instead of the actual source location. This caused type mismatch errors to report nonsensical locations and LSP diagnostics to be lost.Changes
mExprAndArg(the full App range) instead ofmLeftExpras themWholeparameter toTcComputationExpression, so the synthesizedZero()call receives a meaningful range when the CE body is empty.SynExpr.ImplicitZerotranslation, fall back toceenv.mWholewhen the incoming range isrange0, defensively preventing zero-ranged synthesized calls from reaching codegen/diagnostics.Tests
Added
tests/FSharp.Compiler.ComponentTests/Language/CE_PipelineRange19550.fswith comprehensive tests covering:Release Notes
Added entry in
docs/release-notes/.FSharp.Compiler.Service/11.0.100.md.