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65 lines
1.3 KiB
Markdown
65 lines
1.3 KiB
Markdown
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```ucm:hide
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scratch/main> builtins.merge
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```
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```unison:hide
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printLine : Text ->{IO} ()
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printLine msg =
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_ = putBytes.impl (stdHandle StdOut) (Text.toUtf8 (msg ++ "\n"))
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()
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-- An unannotated main function
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main1 = '(printLine "\nhello world!")
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-- Another variation
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main2 _ = printLine "🌹"
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-- An annotated main function
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main3 : '{IO} ()
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main3 _ = printLine "🦄 ☁️ 🌈"
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```
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Testing a few variations here:
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* Should be able to run annotated and unannotated main functions in the current file.
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* Should be able to run annotated and unannotated main functions from the codebase.
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```ucm
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scratch/main> run main1
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scratch/main> run main2
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scratch/main> run main3
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scratch/main> add
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scratch/main> rename.term main1 code.main1
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scratch/main> rename.term main2 code.main2
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scratch/main> rename.term main3 code.main3
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```
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The renaming just ensures that when running `code.main1`, it has to get that main from the codebase rather than the scratch file:
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```ucm
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scratch/main> run code.main1
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scratch/main> run code.main2
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scratch/main> run code.main3
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```
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Now testing a few variations that should NOT typecheck.
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```unison:hide
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main4 : Nat ->{IO} Nat
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main4 n = n
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main5 : Nat ->{IO} ()
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main5 _ = ()
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```
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This shouldn't work since `main4` and `main5` don't have the right type.
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```ucm:error
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scratch/main> run main4
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```
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```ucm:error
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scratch/main> run main5
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```
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