Better error message for "undeclared identifier"

[dom96]

This error could be improved in many ways, one way that I think would help a lot is in the following case:

var FooBar = 5
echo(fooBar)

Instead of just

Error: undeclared identifier: 'foobar'

If an identifier with the same name but different case in the first letter exists, it would be nice to include . 'FooBar' is declared but remember that first letter is case sensitive.

[Araq]

What else do you want? A compiler making you breakfast. It's counterproductive to always blame the compiler for everything.

[def-]

Haskell's GHC has a nice way of handling this, searching for similar identifiers in general:

foobar = "abc"
foo_bar = "def"
bazbaz = "ghi"

main = putStrLn fooBar

Fails with:

[1 of 1] Compiling Main             ( x.hs, x.o )

x.hs:5:17:
    Not in scope: ‘fooBar’
    Perhaps you meant one of these:
      ‘foobar’ (line 1), ‘foo_bar’ (line 2)

[dom96]

Don't be cheeky. This is a legitimate feature request and it will help a lot of newbies.

I want precisely what @def- showed.

[dom96]

I created another general issue for this #3914.

[stale]

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