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What is “type ascription” referring to in this case? [duplicate]

What is type ascription?“Expecting a type here because of type ascription”What does the [Flags] Enum Attribute mean in C#?What is the difference between re.search and re.match?What is the preferred syntax for defining enums in JavaScript?What is a typedef enum in Objective-C?What are enums and why are they useful?How to enumerate an enum with String type?Unable to coerce &String to &strWhat is the “standard” way to concatenate strings?Expected bound lifetime parameter, found concrete lifetime [E0271]What is type ascription?

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0

This question already has an answer here:

• 
  What is type ascription?
  
  1 answer
  
  


• 
  “Expecting a type here because of type ascription”
  
  1 answer
  
  

What is error ascription referring to in this case and how can I fix my code to println based on the arity passed in?

Running the code below throws the error:

error: expected type, found `10`
 --> src/main.rs:21:27
 |
21 | tellTime(Clock:Sundial(10));
 | ^^ expecting a type here because of type ascription

main.rs:

enum Clock 
 Sundial(u8),
 Digital(u8, u8),
 Analog(u8, u8, u8),


fn tellTime(clock: Clock) 
 match clock 
 Clock::Sundial(hours) =>
 println!("Time is: ", hours),
 Clock::Digital(hours, mins) =>
 println!("Time is: :", hours, mins),
 Clock::Analog(hours, mins, secs) =>
 println!("Time is: ::", hours, mins, secs),
 _ => println!("Not a clock!")

 


fn main() 
 tellTime(Clock:Sundial(10));

enums rust match println arity

share|improve this question

edited Mar 26 at 1:31

Shepmaster

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asked Mar 26 at 1:28

Matthew HarwoodMatthew Harwood

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marked as duplicate by Shepmaster rust
Users with the  rust badge can single-handedly close rust questions as duplicates and reopen them as needed.

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Mar 26 at 1:29

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  You have a typo. You meant Clock::Sundial(10) — two colons.
  
  – Shepmaster
  Mar 26 at 1:30
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Idiomatic Rust uses snake_case for variables, methods, macros, fields and modules; UpperCamelCase for types and enum variants; and SCREAMING_SNAKE_CASE for statics and constants. Use tell_time instead, please.
  
  – Shepmaster
  Mar 26 at 1:30
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Note that this does not match on arity — that's not possible. This matches on the name of the enum variant. The variants happen to have different arity, but they don't need to.
  
  – Shepmaster
  Mar 26 at 1:33
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I bought your series btw ;) I'm literally going through it lol. I'm sure you noticed lol
  
  – Matthew Harwood
  Mar 26 at 1:36
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That's wonderful! I did think to myself that the sundial example seemed familiar, but I chalked it up to just being a common example ^_^
  
  – Shepmaster
  Mar 26 at 1:38
  

  
  
  
  

add a comment | 

0

This question already has an answer here:

• 
  What is type ascription?
  
  1 answer
  
  


• 
  “Expecting a type here because of type ascription”
  
  1 answer
  
  

What is error ascription referring to in this case and how can I fix my code to println based on the arity passed in?

Running the code below throws the error:

error: expected type, found `10`
 --> src/main.rs:21:27
 |
21 | tellTime(Clock:Sundial(10));
 | ^^ expecting a type here because of type ascription

main.rs:

enum Clock 
 Sundial(u8),
 Digital(u8, u8),
 Analog(u8, u8, u8),


fn tellTime(clock: Clock) 
 match clock 
 Clock::Sundial(hours) =>
 println!("Time is: ", hours),
 Clock::Digital(hours, mins) =>
 println!("Time is: :", hours, mins),
 Clock::Analog(hours, mins, secs) =>
 println!("Time is: ::", hours, mins, secs),
 _ => println!("Not a clock!")

 


fn main() 
 tellTime(Clock:Sundial(10));

enums rust match println arity

share|improve this question

edited Mar 26 at 1:31

Shepmaster

172k1919 gold badges376376 silver badges525525 bronze badges

asked Mar 26 at 1:28

Matthew HarwoodMatthew Harwood

6,4221919 gold badges8585 silver badges170170 bronze badges

marked as duplicate by Shepmaster rust
Users with the  rust badge can single-handedly close rust questions as duplicates and reopen them as needed.

StackExchange.ready(function()
if (StackExchange.options.isMobile) return;

$('.dupe-hammer-message-hover:not(.hover-bound)').each(function()
var $hover = $(this).addClass('hover-bound'),
$msg = $hover.siblings('.dupe-hammer-message');

$hover.hover(
function()
$hover.showInfoMessage('',
messageElement: $msg.clone().show(),
transient: false,
position: my: 'bottom left', at: 'top center', offsetTop: -7 ,
dismissable: false,
relativeToBody: true
);
,
function()
StackExchange.helpers.removeMessages();

);
);
);
Mar 26 at 1:29

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  You have a typo. You meant Clock::Sundial(10) — two colons.
  
  – Shepmaster
  Mar 26 at 1:30
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Idiomatic Rust uses snake_case for variables, methods, macros, fields and modules; UpperCamelCase for types and enum variants; and SCREAMING_SNAKE_CASE for statics and constants. Use tell_time instead, please.
  
  – Shepmaster
  Mar 26 at 1:30
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Note that this does not match on arity — that's not possible. This matches on the name of the enum variant. The variants happen to have different arity, but they don't need to.
  
  – Shepmaster
  Mar 26 at 1:33
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I bought your series btw ;) I'm literally going through it lol. I'm sure you noticed lol
  
  – Matthew Harwood
  Mar 26 at 1:36
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That's wonderful! I did think to myself that the sundial example seemed familiar, but I chalked it up to just being a common example ^_^
  
  – Shepmaster
  Mar 26 at 1:38
  

  
  
  
  

add a comment | 

This question already has an answer here:

• 
  What is type ascription?
  
  1 answer
  
  


• 
  “Expecting a type here because of type ascription”
  
  1 answer
  
  

What is error ascription referring to in this case and how can I fix my code to println based on the arity passed in?

Running the code below throws the error:

error: expected type, found `10`
 --> src/main.rs:21:27
 |
21 | tellTime(Clock:Sundial(10));
 | ^^ expecting a type here because of type ascription

main.rs:

enum Clock 
 Sundial(u8),
 Digital(u8, u8),
 Analog(u8, u8, u8),


fn tellTime(clock: Clock) 
 match clock 
 Clock::Sundial(hours) =>
 println!("Time is: ", hours),
 Clock::Digital(hours, mins) =>
 println!("Time is: :", hours, mins),
 Clock::Analog(hours, mins, secs) =>
 println!("Time is: ::", hours, mins, secs),
 _ => println!("Not a clock!")

 


fn main() 
 tellTime(Clock:Sundial(10));

enums rust match println arity

share|improve this question

edited Mar 26 at 1:31

Shepmaster

172k1919 gold badges376376 silver badges525525 bronze badges

asked Mar 26 at 1:28

Matthew HarwoodMatthew Harwood

6,4221919 gold badges8585 silver badges170170 bronze badges

error: expected type, found `10`
 --> src/main.rs:21:27
 |
21 | tellTime(Clock:Sundial(10));
 | ^^ expecting a type here because of type ascription

enum Clock 
 Sundial(u8),
 Digital(u8, u8),
 Analog(u8, u8, u8),


fn tellTime(clock: Clock) 
 match clock 
 Clock::Sundial(hours) =>
 println!("Time is: ", hours),
 Clock::Digital(hours, mins) =>
 println!("Time is: :", hours, mins),
 Clock::Analog(hours, mins, secs) =>
 println!("Time is: ::", hours, mins, secs),
 _ => println!("Not a clock!")

 


fn main() 
 tellTime(Clock:Sundial(10));

share|improve this question

edited Mar 26 at 1:31

Shepmaster

172k1919 gold badges376376 silver badges525525 bronze badges

asked Mar 26 at 1:28

Matthew HarwoodMatthew Harwood

6,4221919 gold badges8585 silver badges170170 bronze badges

share|improve this question

edited Mar 26 at 1:31

Shepmaster

172k1919 gold badges376376 silver badges525525 bronze badges

asked Mar 26 at 1:28

Matthew HarwoodMatthew Harwood

6,4221919 gold badges8585 silver badges170170 bronze badges

edited Mar 26 at 1:31

Shepmaster

172k1919 gold badges376376 silver badges525525 bronze badges

edited Mar 26 at 1:31

Shepmaster

172k1919 gold badges376376 silver badges525525 bronze badges

asked Mar 26 at 1:28

Matthew HarwoodMatthew Harwood

6,4221919 gold badges8585 silver badges170170 bronze badges

asked Mar 26 at 1:28

Matthew HarwoodMatthew Harwood

6,4221919 gold badges8585 silver badges170170 bronze badges