85341d02ac
This PR gives a simpler semantics to `noncomputable`, improving predictability as well as preparing codegen to be moved into a separate build step without breaking immediate generation of error messages. Specifically, `noncomputable` is now needed whenever an axiom or another `noncomputable` def is used by a def except for the following special cases: * uses inside proofs, types, type formers, and constructor arguments corresponding to (fixed) inductive parameters are ignored * uses of functions marked `@[extern]/@[implemented_by]/@[csimp]` are ignored * for applications of a function marked `@[macro_inline]`, noncomputability of the inlining is instead inspected # Breaking change After this change, more `noncomputable` annotations than before may be required in exchange for improved future stability.
21 lines
288 B
Text
21 lines
288 B
Text
@[macro_inline]
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noncomputable def noncomp (a : Nat) : Nat := a
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@[macro_inline]
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def f (_ b : Nat) : Nat := b
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def g (b : Nat) := f (noncomp 0) b
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def h (b : Nat) := f (Classical.choice inferInstance) b
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/--
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info: 37
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-/
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#guard_msgs in
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#eval g 37
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/--
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info: 42
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-/
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#guard_msgs in
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#eval h 42
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