juvix/tests/positive/Symbols.juvix

module Symbols;
  open import Stdlib.Data.Nat;

  ╘⑽╛ : Nat;
  ╘⑽╛ := suc nine;

  -- no - function!?
  - : Nat -> Nat -> Nat;
  - := (+);

  （-） : Nat -> Nat -> Nat;
  （-） := (-);

  （*） : Nat -> Nat -> Nat;
  （*） := (*);

  infixl 6 －;
  － : Nat -> Nat -> Nat;
  － := （-）;

  infixl 7 ·;
  · : Nat -> Nat -> Nat;
  · := （*）;

  （0） : Nat;
  （0） := ╘⑽╛ － ╘⑽╛ · zero;

  主功能 : Nat;
  主功能 := （0）;

  axiom = : Type;

  K : Nat → Nat → Nat;
  K =a@zero (=) := =a · =;
  K =a@(suc =) == := = · ==;
end;
-												Widens the accepted symbol list (#1385)

* Changed the valid symbols from inclusvie to exclusive

* Add test using the new valid symbols
											
										
										
											2022-07-18 14:32:43 +03:00
+								module Symbols;
 								  open import Stdlib.Data.Nat;
-												remove ≔ from the language and replace it by := (#1563)

* remove ≔ from the language and replace it by :=

* revert accidental changes in juvix input mode

* update stdlib submodule

* rename ℕ by Nat in the tests and examples

* fix shell tests
											
										
										
											2022-09-30 03:55:32 +03:00
+								  ╘⑽╛ : Nat;
 								  ╘⑽╛ := suc nine;
-												Widens the accepted symbol list (#1385)

* Changed the valid symbols from inclusvie to exclusive

* Add test using the new valid symbols
											
										
										
											2022-07-18 14:32:43 +03:00
-												Improve error message for confusing ':=' with '=' (#1715)

Closes #1483 

The error now points to the offending `=`, works correctly with
multi-line clauses, and explains exactly what's wrong. E.g. for
```agda
f : Nat → Nat → Nat;
f zero x = x;
```
we get
```
  |
6 | f zero x = x;
  |           ^
expected ":=" instead of "="
```
A minor disadvantage of the proposed solution is that now it's
impossible to use `=` without parentheses as a top variable name in a
pattern, e.g.
```
f zero = := =;
```
gives an error.

However, if one really wants to name a variable `=`, it is enough just
to enclose it in parentheses:
```agda
f : Nat → Nat → Nat;
f zero (=) := =;
f (suc n) (=) := f n =;
```

I believe this slight non-uniformity is well worth the increased
usability due to a better error message. Confusing `:=` with `=` is very
common. Using `=` as a variable name in a top pattern is rare.

Co-authored-by: janmasrovira <janmasrovira@gmail.com>
											
										
										
											2023-01-11 18:43:16 +03:00
+								  -- no - function!?
 								  - : Nat -> Nat -> Nat;
 								  - := (+);
-												Widens the accepted symbol list (#1385)

* Changed the valid symbols from inclusvie to exclusive

* Add test using the new valid symbols
											
										
										
											2022-07-18 14:32:43 +03:00
-												remove ≔ from the language and replace it by := (#1563)

* remove ≔ from the language and replace it by :=

* revert accidental changes in juvix input mode

* update stdlib submodule

* rename ℕ by Nat in the tests and examples

* fix shell tests
											
										
										
											2022-09-30 03:55:32 +03:00
+								  （-） : Nat -> Nat -> Nat;
 								  （-） := (-);
-												Widens the accepted symbol list (#1385)

* Changed the valid symbols from inclusvie to exclusive

* Add test using the new valid symbols
											
										
										
											2022-07-18 14:32:43 +03:00
-												remove ≔ from the language and replace it by := (#1563)

* remove ≔ from the language and replace it by :=

* revert accidental changes in juvix input mode

* update stdlib submodule

* rename ℕ by Nat in the tests and examples

* fix shell tests
											
										
										
											2022-09-30 03:55:32 +03:00
+								  （*） : Nat -> Nat -> Nat;
 								  （*） := (*);
-												Widens the accepted symbol list (#1385)

* Changed the valid symbols from inclusvie to exclusive

* Add test using the new valid symbols
											
										
										
											2022-07-18 14:32:43 +03:00
 								  infixl 6 －;
-												remove ≔ from the language and replace it by := (#1563)

* remove ≔ from the language and replace it by :=

* revert accidental changes in juvix input mode

* update stdlib submodule

* rename ℕ by Nat in the tests and examples

* fix shell tests
											
										
										
											2022-09-30 03:55:32 +03:00
+								  － : Nat -> Nat -> Nat;
 								  － := （-）;
-												Widens the accepted symbol list (#1385)

* Changed the valid symbols from inclusvie to exclusive

* Add test using the new valid symbols
											
										
										
											2022-07-18 14:32:43 +03:00
 								  infixl 7 ·;
-												remove ≔ from the language and replace it by := (#1563)

* remove ≔ from the language and replace it by :=

* revert accidental changes in juvix input mode

* update stdlib submodule

* rename ℕ by Nat in the tests and examples

* fix shell tests
											
										
										
											2022-09-30 03:55:32 +03:00
+								  · : Nat -> Nat -> Nat;
 								  · := （*）;
-												Widens the accepted symbol list (#1385)

* Changed the valid symbols from inclusvie to exclusive

* Add test using the new valid symbols
											
										
										
											2022-07-18 14:32:43 +03:00
-												remove ≔ from the language and replace it by := (#1563)

* remove ≔ from the language and replace it by :=

* revert accidental changes in juvix input mode

* update stdlib submodule

* rename ℕ by Nat in the tests and examples

* fix shell tests
											
										
										
											2022-09-30 03:55:32 +03:00
+								  （0） : Nat;
 								  （0） := ╘⑽╛ － ╘⑽╛ · zero;
-												Widens the accepted symbol list (#1385)

* Changed the valid symbols from inclusvie to exclusive

* Add test using the new valid symbols
											
										
										
											2022-07-18 14:32:43 +03:00
-												remove ≔ from the language and replace it by := (#1563)

* remove ≔ from the language and replace it by :=

* revert accidental changes in juvix input mode

* update stdlib submodule

* rename ℕ by Nat in the tests and examples

* fix shell tests
											
										
										
											2022-09-30 03:55:32 +03:00
+								  主功能 : Nat;
 								  主功能 := （0）;
-												Improve error message for confusing ':=' with '=' (#1715)

Closes #1483 

The error now points to the offending `=`, works correctly with
multi-line clauses, and explains exactly what's wrong. E.g. for
```agda
f : Nat → Nat → Nat;
f zero x = x;
```
we get
```
  |
6 | f zero x = x;
  |           ^
expected ":=" instead of "="
```
A minor disadvantage of the proposed solution is that now it's
impossible to use `=` without parentheses as a top variable name in a
pattern, e.g.
```
f zero = := =;
```
gives an error.

However, if one really wants to name a variable `=`, it is enough just
to enclose it in parentheses:
```agda
f : Nat → Nat → Nat;
f zero (=) := =;
f (suc n) (=) := f n =;
```

I believe this slight non-uniformity is well worth the increased
usability due to a better error message. Confusing `:=` with `=` is very
common. Using `=` as a variable name in a top pattern is rare.

Co-authored-by: janmasrovira <janmasrovira@gmail.com>
											
										
										
											2023-01-11 18:43:16 +03:00
 								  axiom = : Type;
 								  K : Nat → Nat → Nat;
 								  K =a@zero (=) := =a · =;
 								  K =a@(suc =) == := = · ==;
-												remove ≔ from the language and replace it by := (#1563)

* remove ≔ from the language and replace it by :=

* revert accidental changes in juvix input mode

* update stdlib submodule

* rename ℕ by Nat in the tests and examples

* fix shell tests
											
										
										
											2022-09-30 03:55:32 +03:00
+								end;