Compiler diagnostic when a semicolon is missing should be more detailed.

[jaguilar]

The optional semicolon is a possible tripping point for people new to Go language. Since
it 
seems that changing it to be required will not happen, we should have good diagnostics
to help 
people know when it has been omitted incorrectly.

Consider foo.go:

package main
func main() {
    i := 1
    i = i + i
}

If you do 6g foo.go, the error message printed is:

$ 6g foo.go
foo.go:4: syntax error near i

The error message should be more detailed since new users may have trouble finding the 
problem:

foo.go:4: statements in functions must be separated by semicolons

[rsc]

Comment 1:

Status changed to Duplicate.

Merged into issue #89.

[rsc]

Comment 2:

This issue was closed by revision 3997495.

Status changed to Fixed.

Merged into issue #-89.